The largest earthen structure in North America, outside of Mexico, is found at the site of Cahokia.
Cahokia is a UNESCO World Heritage site located in southern Illinois. It is known for its earthen mounds and was once the largest pre-Columbian settlement north of Mexico.
The city was built by the Mississippians, a Native American civilization that flourished in the Mississippi River valley from around 800 to 1500 AD.
The largest mound at Cahokia, known as Monks Mound, is a massive earthen structure that stands 100 feet tall and covers 14 acres of land.
It was likely used for ceremonial purposes and is believed to have been the focal point of the city. Other notable mounds at Cahokia include the Grand Plaza, which was likely used for public gatherings and ceremonies, and the Woodhenge, a circular arrangement of posts that may have been used for astronomical observations.
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According to the US National Snow and Ice Data Center, there have been __________ ice age cycles on Earth during the last 750,000 years.
Answer:
According to the US National Snow and Ice Data Center, there have been eight ice age cycles on Earth during the last 750,000 years.
According to the US National Snow and Ice Data Center, there have been eight ice age cycles on Earth during the last 750,000 years.
The Earth is not the same as it was millions of years ago. In fact, the planet has seen numerous changes and transformations throughout its life. The climate is one of the most significant factors that have impacted the Earth in this process. The climate has gone through many changes over the centuries. The Earth's climate, for example, has gone through a number of ice ages. Ice ages are periods of time when the Earth's temperature falls considerably, resulting in glaciers and ice sheets.
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the primary reason why north america has a high number of, and certainly much more than its global share, severe thunderstorms, is the:
The primary reason why North America has a high number of severe thunderstorms is the collision of air masses.
North America is located in an area where cold air from Canada meets warm, moist air from the Gulf of Mexico. This creates a boundary called a "front" where the two air masses collide, causing the warm air to rise rapidly and form thunderstorms. This collision of air masses occurs frequently in North America, leading to a high number of severe thunderstorms. Additionally, the geography of North America, with its varied topography and large bodies of water, creates ideal conditions for the formation of thunderstorms.
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2. given a mean earth radius of 20,906,000 ft, and an observation latitude of n 47 degrees, what is the arc distance of one second of longitude and one second of latitude?
At 47 degrees latitude, one second of longitude is equivalent to about 49.03 feet of arc distance, whereas one second of latitude is equivalent to about 100.76 feet of arc distance.
The following formula can be used to determine the arc distance of one second of longitude at a specific latitude:
Mean Earth Radius x Cosine of Latitude x Arc Distance (angular distance)
where 1/3600 degrees is the angular distance (since there are 3600 seconds in one degree). When we enter the values from the issue, we obtain:
One second's worth of longitude is represented by the formula (20,906,000 ft) x (cosine 47) x (1/3600) = 49.03 ft.
Similarly, the formula: can be used to get the arc distance of one second of latitude.
(Mean Earth Radius) x = arc distance (angular distance)
When we enter the values from the issue, we obtain:
One second of latitude is equal to 20 906,000 feet multiplied by 1/36 equals 100.76 feet.
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a sandstone bed strikes 140 across a stream. the tresam flows down a narrow gorge with vertical walls. the apparent dip of the bed on the walls of the gorge is 25, 095. what is the true dip of the bed?
Answer : The true dip of that sandstone bed is 25°95'.
The apparent dip of the bed on the walls of the gorge is the angle that the bed strikes across the stream and down the narrow gorge. we calculate the angle of the bed relative to the horizontal plane. The true dip is the angle of inclination of the bed below the horizontal plane.
True dip = 90° - (90° - 25°95') = 25°95'. the true dip of the sandstone bed is 25°95', which is the angle of inclination of the bed below the horizontal plane.
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most sediment on the continental shelf is derived from a. erosion on the continent b. life in the sea c. aliens d. chemical reactions in the water
Chemical reactions in the water and aliens are not significant sources of sediment on the continental shelf. The correct option is d.
Most sediment on the continental shelf is derived from erosion on the continent.
What is the continental shelf?The shallow oceanic area is known as the continental shelf.
It is located next to the shore and extends from the shore to the continental slope.
The water depth in the continental shelf ranges from 100 meters to 200 meters, depending on the location, and the slope of the shelf ranges from 0.1 to 1 degree.
The main source of sediment on the continental shelf is erosion on the continent.
When rocks and soil are exposed to the elements, such as wind, rain, and temperature fluctuations, they begin to erode.
This can result in sediment that is transported by rivers to the ocean and deposited on the continental shelf.
Other sources of sediment on the continental shelf include volcanic eruptions, underwater landslides, and other natural events.
Life in the sea is also a source of sediment, as organisms such as corals and clams produce shells and other materials that eventually break down and contribute to the sediment on the sea floor.
However, the primary source of sediment on the continental shelf is erosion on the continent.
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in addition to the mineral above, this rock also contains quartz, plagioclase, muscovite, and kyanite. based on your observations and the mineral assemblage, what kind of rock is this? choose one: a. phyllite b. gneiss c. quartzite d. slate e. schist
Phyllite is a kind of rock that also contains quartz, plagioclase, muscovite, and kyanite. Thus, option a is correct.
Phyllite is generally located black to gray, or light greenish-gray in color inside the earth. It has a wrinkled or wavy formation as its foliation. Phyllite is a stable and very soft rock that is formed naturally by the wind. It is mainly used by cemetery markers in buildings.
Phyllites are most typically found in the Dalradian metasediments of northwest Arran areas. Quartz and feldspar are discovered in large amounts in phyllite. Phyllite has a reasonable preference to break into sheets. Tredorn Phyllite and Woolgarden phyllites are found in North Cornwall along the banks of the rivers.
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which of the following is a result of seafloor spreading?
a. Trenches form at transform boundaries.
b. Mid ocean ridges form at convergent boundaries.
c. Mid ocean ridges form at divergent plate boundaries
d. Trenches form at divergent boundaries.
if you are at 66 degrees north on first day of winter in northern hemisphere, what will you experience?
On the first day of winter in the northern hemisphere, if you are at 66 degrees north, you will experience cold temperatures, short daylight hours, and potentially snowfall. The sun will set earlier and the temperatures will drop, often below 0 degrees Celsius (32 degrees Fahrenheit).
This region is well within the Arctic Circle, so you can expect the winter to be cold and dark. During the day, temperatures may not reach above freezing, and in the evening they will drop even further. Snowfall is common and the region will be quite dark, as the sun is much lower in the sky at this time of year. During the winter solstice, the sun may only be visible for a few hours each day in this area.
Temperature in the poles around northern hemisphere is too low for any human settlement, lack of direct sunlight is one of the major reason for this extremely low temperature and harsh climate.
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europe's economy has become strong in the last decade because of what?
a. entrepreneurship
b. better leaders
c. communism
Europe's economy has become strong in the last decade primarily due to A. entrepreneurship.
How has entrepreneurship helped Europe ?Entrepreneurship has played a crucial role in driving economic growth in Europe, with many startups and innovative businesses contributing to the economy. These businesses have created new jobs, brought new products and services to market, and helped to increase overall productivity.
Communism, on the other hand, is not a major factor in Europe's economic growth. Most European countries have moved away from communism over the past several decades, and instead have adopted market-based economies that prioritize private enterprise and competition.
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the annual cycle of prevailing weather conditions at a given place based on long-term contitions is known as: weather. a trend cyclone climate global warming
The annual cycle of prevailing weather conditions at a given place based on long-term conditions is known as climate.
The term weather is used to refer to short-term conditions such as precipitation, temperature, and wind. The climate of a region is determined by a variety of factors, including latitude, elevation, prevailing winds, and the presence of land and water bodies.
It can be classified into different categories based on temperature, precipitation, and other factors. In general, climate change refers to long-term changes in weather patterns and temperature around the world, while global warming refers specifically to the gradual warming of the planet's surface due to increased levels of greenhouse gases in the atmosphere. Cyclones, on the other hand, are severe tropical storms that can cause significant damage and loss of life. Trends are statistical measurements of changes over time. The correct answer is "climate."
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which of the following glacial features is indicative of the local climate becoming dry and cold? group of answer choices boulder trains. striation. drumlins. loess.
The glacial feature that is indicative of a local climate becoming dry and cold is loess.
Loess is an unconsolidated, silty sediment deposited by the wind, typically found in arid or semi-arid climates. It is usually found on the leeward side of mountains and hills, and is often found in association with glacial deposits.
This process is often found in regions of glacial feature, such as mountain ranges and hillsides. The sediment accumulates in layers of silt, which eventually hardens and forms loess.
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an example of a primary effect of drought is question 15 options: a drop in groundwater levels rolling blackouts a decrease in tourism low dissolved oxygen content in reservoirs
An example of a primary effect of drought is a drop in groundwater levels.
When droughts occur, one of the most common outcomes is a drop in groundwater levels. As the amount of precipitation drops, the amount of water that enters the soil also drops, resulting in a decrease in groundwater levels. As groundwater levels decline, it becomes more challenging to access enough water to meet the needs of communities and agriculture.
As a result, water scarcity becomes an increasingly serious issue.
Therefore, a drop in groundwater levels is a primary effect of drought. Rolling blackouts, a decrease in tourism, and low dissolved oxygen content in reservoirs are all secondary effects of drought.
Drought is a prolonged dry period in the natural climate cycle that can occur anywhere in the world. It is a slow-onset disaster characterized by the lack of precipitation, resulting in a water shortage. Drought can have a serious impact on health, agriculture, economies, energy and the environment.
Answer: a drop in groundwater levels.
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based upon your analysis, most stratovolcanoes form in which tectonic setting? group of answer choices divergent boundaries oceanic-continental convergent boundaries mantle plumes (hotspots) all of the above
The correct option is All of the above i.e. D. Most stratovolcanoes form in convergent boundaries, which occur when two tectonic plates collide. This collision causes one of the plates to slide beneath the other, creating a subduction zone.
The subducting plate melts due to the extreme pressure and heat created from the collision, resulting in magma being forced upward to form a stratovolcano. Oceanic-continental divergent boundaries can also form stratovolcanoes, as the plate separation creates a rift zone.
Mantle plumes, also known as hotspots, can also form stratovolcanoes when a column of hot material from the mantle rises up through the Earth's crust, creating a weak area of the crust which can then be filled with magma. All of these tectonic settings can create stratovolcanoes. The correct option is All of the above i.e. D.
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What are the 5 stages of solar system formation?
The 5 stages of solar system formation are Solar Nebula, Protostar and Protoplanetary Disk, Planetesimals, Protoplanets and Solar System.
The 5 stages of solar system formation are:
1. Solar Nebula: A cloud of dust and gas, called the solar nebula, begins to collapse due to gravitational forces. As it collapses, the material starts to spin and flatten into a disk shape.
2. Protostar and Protoplanetary Disk: The material in the center of the disk becomes denser, forming a protostar. Meanwhile, the remaining material in the disk starts to clump together, creating a protoplanetary disk around the protostar.
3. Planetesimals: Within the protoplanetary disk, solid particles collide and stick together, forming larger bodies called planetesimals. These planetesimals continue to grow as they collect more material from the disk.
4. Protoplanets: As planetesimals grow and interact, some merge through collisions, eventually forming larger bodies known as protoplanets. Protoplanets continue to evolve and differentiate, developing into the planets we observe in our solar system today.
5. Solar System: Over time, the protostar at the center of the system becomes a fully-fledged star (our Sun), while the remaining protoplanetary disk material is cleared out, leaving the planets, moons, asteroids, and other bodies orbiting the star. This marks the formation of the solar system.
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describe the major differences in the abiotic factors observed in the high tide zone versus the lower inter tidal zone.
The abiotic factors observed in the high tide zone versus the lower intertidal zone are different. The major differences in the abiotic factors observed in the high tide zone versus the lower intertidal zone are as follows:
Abiotic factors in the high tide zone: In the high tide zone, the abiotic factors include temperature fluctuations, wave exposure, and variations in salinity. This region is typically less exposed to sunlight and air because the tide comes in and out of this zone quickly.
The high tide zone can experience strong wave action, as well as wind and water fluctuations. These factors all contribute to making it a challenging environment for plants and animals to survive.
Abiotic factors in the lower intertidal zone: In the lower intertidal zone, the abiotic factors include water pressure, light exposure, temperature fluctuations, and salinity. This region is typically more exposed to sunlight and air because the tide takes longer to come in and out.
The lower intertidal zone also experiences less wave action than the high tide zone. These factors make the lower intertidal zone an easier environment for plants and animals to survive.
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in general, what do beaches look like at the end of winter?
Winter – Higher winter waves move sand offshore and narrow the beach. … The summer beach is covered with a layer of sand that is moved south by the longshore currents and onshore by low waves. The winter beach is denuded of sand by high storm waves.
In general, beaches look different at the end of winter compared to the peak of summer. During winter, beaches are often deserted and quiet, with fewer visitors and tourists.
The weather is usually cooler, and the water is colder, making swimming and water sports less popular. Additionally, beaches may be covered in debris, seaweed, and other natural materials that have washed up during storms or high tides. The sand may also be covered in snow, depending on the region.
However, despite the cooler weather and fewer visitors, winter beaches can be a beautiful and peaceful place to visit. Many people enjoy long walks along the shoreline, watching the waves crash against the shore, and taking in the natural beauty of the coast.
In conclusion, beaches look different at the end of winter compared to the peak of summer. They are often quieter, colder, and covered in natural materials. Despite this, they can be a beautiful and peaceful place to visit during the off-season.
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E. Explain ONE challenge a representative might face in connecting with rural constituents as
compared with constituents in urban areas.
Answer:
One challenge a representative might face in connecting with rural constituents as compared with constituents in urban areas is the issue of geographic distance. Rural areas are often more spread out and have lower population densities than urban areas, which can make it more difficult for representatives to physically reach their constituents. This can make it harder for representatives to hold town hall meetings, attend community events, and meet with constituents one-on-one. Additionally, rural areas may have limited access to technology and internet connectivity, which can make it harder for representatives to communicate with their constituents through email, social media, and other digital channels. As a result, representatives may need to be more creative in finding ways to connect with their rural constituents, such as holding virtual town hall meetings or partnering with local organizations to reach out to rural communities.
8. What is the collective role of water vapor, carbon dioxide, ozone, and methane in the atmosphere?
A. They prevent harmful ultraviolet radiation of the sun from reaching earth
B. they are important components of the water cycle, which regulates the earths temperature
C. they regulate earths climate by trapping heat and holding it within earths atmosphere
D. they scatter almost a third of the sunlight that reaches the outer layers of the atmosphere back into space
Answer: C. They regulate Earth's climate by trapping heat and holding it within Earth's atmosphere.
he type of turbulence that develops when wind speed changes rapidly with height is: group of answer choices thermal turbulence adiabatic turbulence political turbulence shear-induced turbulence
The type of turbulence that develops when wind speed changes rapidly with height is known as shear-induced turbulence. Therefore the correct option E.
Turbulence is a disruptive event that can cause high-intensity fluctuation flows in different mediums. It is characterized by irregular, chaotic, and random fluctuations in velocity, pressure, and other fluid properties.
Turbulence is commonly observed in many natural and human-made systems, including oceans, rivers, the atmosphere, and industrial applications such as airplane engines and pipelines.
Shear-induced turbulence develops when there is a change in wind speed with height. This phenomenon occurs when the horizontal velocity gradient causes vertical shear and results in turbulent eddies. Therefore the correct option E.
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The following question may be like this:
The type of turbulence that develops when wind speed changes rapidly with height is: a) thermal turbulence b) political turbulence c) adiabatic turbulence d) mechanical turbulence e) shearinduced turbulence
Help me with this please.
Evidence Card: Prevailing Winds in a Normal Year.
Explanation of Evidence: Prevailing winds near the equator affect ocean temperatures and currents, which in turn can influence weather patterns globally, including in Christchurch.
Best Supported Claim: Christchurch's air temperature during El Niño years is cooler than usual because the prevailing winds near the equator change, leading to altered ocean temperatures and currents that affect global weather patterns.
What is the evidence about?The evidence from the Prevailing Winds in a Normal Year card suggests that the prevailing winds near the equator can influence ocean temperatures and currents, which in turn can have a global impact on weather patterns. This information is relevant to the question at hand because El Niño is a phenomenon that occurs when the prevailing winds in the equatorial Pacific weaken or reverse, causing warmer than usual ocean temperatures and altering weather patterns globally.
Therefore, the best-supported claim is that Christchurch's air temperature during El Niño years is cooler than usual because the prevailing winds near the equator change, leading to altered ocean temperatures and currents that affect global weather patterns.
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does the change of environment from the base of the section up to the thick gray shale indicate an advance (transgression) or retreat (regression) of the sea?
The change of environment from the basal conglomerate to the thick gray shale indicates a transgression of the sea, as smaller clast size suggests a deeper marine environment.
During a transgression, sea level rises, leading to the inundation of previously exposed land areas. As the sea advances, the environment changes from terrestrial to marine, and sediments deposited also change from coarser to finer-grained. In this case, the transition from the basal conglomerate to the thick gray shale suggests a deepening of the marine environment as indicated by the decreasing clast size, indicating that the sea level was rising during this period.
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temperature, pressure, wind and moisture are measured through the depth of the troposphere by what instrument? group of answer choices rawinsonde doppler radar goes satellite
Temperature, pressure, wind and moisture are measured through the depth of the troposphere using Rawinsonde instrument.
Rawinsonde is an instrument used to measure various meteorological parameters, including wind, temperature, and humidity. Rawinsonde is a balloon-borne instrument that is released into the air, and it sends back data as it rises. The balloon can rise to an altitude of around 100,000 feet before bursting, and the Rawinsonde instrument falls back to Earth. The data from the instrument are used to create a sounding, which is a profile of the atmosphere's temperature, pressure, and humidity as a function of altitude. The troposphere is the region of the atmosphere that is closest to the surface. It extends from the Earth's surface up to about 7-20 kilometers, depending on the latitude. The Rawinsonde instrument is used to measure the various meteorological parameters in the troposphere.
The Rawinsonde instrument consists of a weather balloon that is filled with helium gas. The balloon is released from the surface, and it rises through the atmosphere. As the balloon rises, the Rawinsonde instrument collects data on various meteorological parameters, including wind, temperature, and humidity. The data collected from the instrument are used to create a sounding, which is a profile of the atmosphere's temperature, pressure, and humidity as a function of altitude.
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item2 1 points item 2 all of the ecosystems on the planet together are called the multiple choice lithosphere. biosphere. hydrosphere. stratosphere. atmosphere.
The biosphere is the term used to describe all of the ecosystems on the planet.
Biosphere includes the lithosphere (the solid crust of the Earth), the hydrosphere (the liquid water on the planet), the atmosphere (the air surrounding the Earth), and the stratosphere (the layer of air just above the atmosphere). All of these components work together to create the biosphere, and together they form a complex network of interactions. For example, water evaporates from the hydrosphere and condenses in the atmosphere, which then falls back to the Earth's surface as rain or snow. In this way, the biosphere is constantly exchanging materials and energy between its different components.
The biosphere is the Earth's living systems, including all living things on the planet, such as plants, animals, and microorganisms. The biosphere is closely related to the other three systems, as living organisms rely on water, air, and nutrients from the Earth's crust. The biosphere is the most complex and diverse of the Earth's systems, with a vast range of organisms that interact with each other in intricate ways. All the ecosystems on the planet together are called the biosphere.
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The term for all the ecosystems on the planet together is the biosphere, which encompasses all living organisms and their physical environments, including land, water, and air.
Explanation:All of the ecosystems on the planet together are referred to as the biosphere. This term includes all living organisms and their physical environments, spanning over land (lithosphere), water (hydrosphere), and air (atmosphere). The other options listed: lithosphere, hydrosphere, stratosphere, and atmosphere are all components of the biosphere, but they individually do not represent all ecosystems on Earth.
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units a through k are sedimentary layers. l and m are intrusive igneous bodies. the surface of erosion below layer h represents a(n) period of time of about 100 years. true false
units a through k are sediment layers. l and m are intrusive igneous bodies. the surface of erosion below layer h represents a(n) period of time of about 100 years. is True
Long-term accumulations of sediment and debris that land on the earth's surface or in bodies of water typically result in the formation of sedimentary strata. Each layer can represent a distinct geological epoch or timeframe, based on the type of rock and the fossils found in it.The amount of time that a layer was exposed to erosion, weathering, or other geological processes is represented by the surface of erosion beneath it. The length of that period, however, will vary depending on a number of variables, including the type of rock, the environment, the area, and the level of erosion.
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does the southern hemisphere experience hotter summers and colder winters? i ask this because the earth's perihelion is in winter for the northern hemisphere (around january 3rd)
Yes, the Southern Hemisphere does experience hotter summers and colder winters. This is because of the way the Earth's orbit around the Sun is tilted relative to its axis of rotation. The Earth's perihelion, or point of closest approach to the Sun, is in January for the Northern Hemisphere, while it is in July for the Southern Hemisphere.
This means that the Northern Hemisphere gets less direct sunlight during winter, causing colder temperatures, while the Southern Hemisphere gets more direct sunlight during summer, leading to hotter temperatures.
The Earth's axial tilt, or obliquity, is responsible for the Earth's seasons. During winter, the Northern Hemisphere is tilted away from the Sun, and during summer it is tilted towards the Sun. Conversely, the Southern Hemisphere is tilted away from the Sun during summer, and towards the Sun during winter. This difference in angle of sunlight causes the Northern Hemisphere to experience colder winters and hotter summers, while the Southern Hemisphere experiences hotter summers and colder winters.
Additionally, the Southern Hemisphere is more exposed to the ozone layer, which absorbs some of the Sun's ultraviolet radiation, leading to slightly higher temperatures. This explains why the temperatures in the Southern Hemisphere are higher than the Northern Hemisphere during the same season.
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to what extent do we think the geologies of the terrestrial worlds were destined from their births? explain.
The geological features of the terrestrial worlds have been influenced factors such as the initial composition of the protoplanetary disk, the planet's distance from the Sun, its size, the presence or absence of a magnetic field, and others.
The geological features of these planets are thus not predetermined from their birth but are influenced by various factors that continue to act on them.
The geological features of these planets are therefore not predetermined from their birth but are influenced by a variety of factors that continue to act on them.
What is the Terrestrial World?
Terrestrial planets, also known as rocky planets or telluric planets, are planets that are primarily composed of silicate rocks or metals. In contrast to gas giants, which are primarily composed of hydrogen and helium, terrestrial planets have a solid surface layer and a central core that is made up of metal. Mercury, Venus, Earth, and Mars are the four terrestrial planets in our solar system.
The geology of the terrestrial worlds is therefore dependent on a variety of factors, which include factors such as the planet's size, distance from the Sun, and its history of volcanic activity.
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which kind of seismic wave is responsible for the most shaking (and thus, the most damage to human structures)?
The body waves and surface waves responsible for the most shaking.The seismic wave responsible for the most shaking (and thus, the most damage to human structures) is the surface wave.
What are seismic waves?Seismic waves are waves that are generated by earthquakes and other disturbances in the Earth's surface, such as explosions, volcanic activity, and landslides.
They are made up of various types of waves, each with its own distinctive characteristics. There are two types of seismic waves: body waves and surface waves.
Body waves are seismic waves that travel through the Earth's interior. P-waves and S-waves are two types of body waves. Surface waves, on the other hand, are seismic waves that travel along the Earth's surface.
Rayleigh waves and Love waves are two types of surface waves.
Surface waves are responsible for the most shaking (and thus, the most damage to human structures).
The reason for this is that they travel more slowly than body waves, which allows them to cause more sustained shaking.
They are also more complex than body waves, which can cause them to interact with the Earth's surface in unpredictable ways that can lead to more intense shaking.
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in the absence of friction, the combined effect of the coriolis force and the pressure gradient force produces question 75 options: air flow from low to high pressure centers. surface winds. air flow in a north-south direction. geostrophic winds at altitudes above the ground. air flow perpendicular to the isobars.
winds that are geostrophic at heights above the earth. The creation of high and low-pressure systems is a result of geostrophic winds,
A theoretical wind known as geostrophic wind is produced when the atmosphere's Coriolis force and pressure gradient force are balanced. When there is no friction, the air moves at a constant speed parallel to the isobars. In the upper atmosphere, where the pressure gradient force predominates and the Coriolis force is considerable, this sort of wind is frequently observed. The creation of high and low-pressure systems is a result of geostrophic winds, which are also crucial to the atmosphere's general circulation. But friction and turbulence at the Earth's surface also contribute to the complexity and variability of the wind.
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where is the safest place, among those listed below, in the 48 contiguous states with respect to earthquake seismic risk?
The safest place, among those listed below, in the 48 contiguous states with respect to earthquake seismic risk is South Dakota. Thus, Option D is correct.
This is due to its location in the stable interior of the North American Plate, far away from any active plate boundaries or faults.
South Dakota is located in the stable interior of the North American Plate, which means that it is far away from any active plate boundaries or faults. This location makes South Dakota less likely to experience earthquakes compared to other areas located near plate boundaries or faults.
Although earthquakes can occur anywhere, the risk is lower in South Dakota than in other areas such as California or Alaska. Therefore, South Dakota is considered the safest place among those listed below, in the 48 contiguous states with respect to earthquake seismic risk.
Based on this explanation, the correct answer is D.
The complete question:
Where is the safest place, among those listed below, in the 48 contiguous states with respect to earthquake seismic risk?
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what is an aquifer, igneous and metamorphic rocks are not good aquifers as they contain little natural porosity or permeability.
An aquifer is an underground layer of water-bearing permeable rock, rock fractures or unconsolidated materials (gravel, sand, or silt) from which groundwater can be extracted. Igneous and metamorphic rocks generally contain little natural porosity or permeability and therefore cannot be used as aquifers. Igneous rocks, for instance, form when molten magma cools and solidifies.
The cooling process does not leave much space for porosity and permeability. The recrystallization of the rock grains during metamorphism also does not leave much space for porosity and permeability.
Aquifers can be found in sedimentary rocks like sandstone, limestone and shale because the grains of these rocks are arranged in a way that allows for more porosity and permeability.
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