Experimental pH indicates the pH obtained by directly measuring a specific sample with a pH meter.
The main difference between calculated and experimental pH is that calculated pH gives the pH obtained by solving the pH equation whereas experimental pH is measured directly with a pH meter. It is to indicate the value of a particular sample obtained.
Because microorganisms such as bacteria are sensitive to the concentration of hydrogen ions present in the environment, pH results will change over the course of an experiment. pH is affected by larger proteins, including enzymes. pH is a quantitative measure of the acidity or basicity of a solution while acidity is a qualitative measure of the acidic properties of a solution.
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Beryllium, the first element in group 2, has an atomic number of 4. The second element in this group has an atomic number of?.
Answer:
I think 11 yeah.. try that
Explanation:
How does one periodic trend connect a racial trend in American Society? Why is it important to understand racial trends in American Society?
A periodic trend connect a racial trend in American Society ad it affect the distribution of power, wealth, opportunity, and create enduring social stratifications.
It is important to understand racial trends in American Society as it helps in understanding the society better.
How to illustrate the information?A trend is a shift or progression toward something new or different. Global migration is one of the most significant developments nowadays.
Today, 244 million individuals live in nations other than their native countries, which is three times the number in 1960. The world's migrant population would be the sixth largest country.
It should be noted that among the issue of racial trend is also the issue of black lives matter. This is important in order to end discrimination and also enhance the development in the country.
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christian has a mass of 5 kg. he is running across the room accelerating at a rate of 10 m/s2. what is his force?
The force required to move a body with a mass of 5kg and accelerating at 10m/s² is 50 Newtons.
What is the force of Christian?A force is simply a push or pull of a body resulting from the object's interaction with another object.
From Newton's Second Law, force is expressed as;
F = m × a
Where is mass of object and a is the acceleration
Given the data in the question;
Mass m = 5kgAcceleration a = 10m/s²Force F = ?Plug the given values into the equation above and solve for F.
F = m × a
F = 5kg × 10m/s²
F = 50kgm/s²
F = 50N
Therefore, the force of Christian is 50 Newtons.
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The force required to move the body with the mass of 5 kg with acceleration of 10 m/s² is 50 Newtons.
What is force?Force is defined as a push or pull exerted on an object as a result of the interaction of the object with another object.
It can also be defined as an external factor that, when used, alters or has the potential to alter the state of the body.
Force can be expressed as
Force = mass x acceleration
Given, Mass = 5 kg
Acceleration = 10 m/s²
So, F = m x a
F = 5 kg x 10 m/s²
F = 50 kgm/s²
F = 50 Newtons
Thus, the force required to move the body with the mass of 5 kg with acceleration of 10 m/s² is 50 Newtons.
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79.853 ml of 4.988 m sodium fluoride (aq) is added to 23.760 ml of 1.471 m beryllium sulfate. after the reaction is complete, what is the mass of precipitate that has formed?
Using the balanced reaction equation, we can calculate that the mass of the precipitate will be 1.617 g.
To solve this question, we need to write the balanced reaction equation first:
2 NaF(aq) + BeSO₄(aq) → Na₂SO₄(aq) + BeF₂(s)
We can now see that the precipitate will be beryllium fluoride. We can also see that 1 mol of beryllium sulfate reacts with 2 moles of sodium fluoride. Now we can calculate the number of moles (n) of both reactants using their molarities (c) and volumes (V):
c = n/V ⇒ n = c * V
n(NaF) = c(NaF) * V(NaF)
n(NaF) = 4.988 M * 79.854 mL = 0.3983 mol
n(BeSO₄) = c(BeSO₄) * V(BeSO₄)
n(BeSO₄) = 1.471 M * 23.3760 mL
n(BeSO₄) = 0.03439 mol
We can see that n(NaF) is more than 2 times greater than n(BeSO₄), so NaF is in excess, and BeSO₄ is the limiting reactant. Now we can calculate the number of moles of BeF₂ formed:
1 mol BeSO₄ : 1 mol BeF₂ = 0.03439 mol BeSO₄ : X
X = 0.03439 mol BeF₂
We can now convert the number of moles (n = 0.03439 mol) of BeF₂ into mass (m), using the molar mass of BeF₂ (M = 47.01 g/mol):
n = m/M ⇒ m = n * M
m = 0.03439 mol * 47.01 g/mol
m = 1.617 g
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XY + Z→ XZ + Y is an example of a
XY + Z→ XZ + Y is an example of a substitution reaction. A substitution reaction involves the exchange of one atom for another.
Why is a substitution reaction?A substitution reaction involves the exchange of one atom for another. These are extremely useful reactions in the chemical industry because they allow chemists to transform one compound into something more useful, allowing them to construct designer molecules such as drugs.Substitution reactions are classified into two types: nucleophilic reactions and electrophilic reactions. The primary distinction between these two reactions is the type of atom that is attached to the original molecule.The combination of two or more atoms or molecules to form a large molecule is known as an addition reaction. A substitution reaction is one in which an atom or group of atoms is replaced by another atom or group of atoms.To learn more about substitution reaction, refer to:
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Electrons from fadh2 are transferred to succinate reductase and then to a small organic molecule called?.
Electrons from fadh2 are transferred to succinate reductase and then to a small organic molecule called Ubiquinone.
Electron Transport chain?
The electron transport chain main job is to produce an electrochemical gradient. It propels the production of ATP during photosynthesis and cellular respiration in mitochondria and chloroplasts, respectively. Cellular respiration uses it.
Ubiquinone transfer electrons to Complex III from Complexes I and II as well as from other mitochondrial dehydrogenases by acting as an electron transporter in the mitochondrial respiratory chain.
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Al + Pb(NO3)2 -------------------------------> ? fasttttttttttttttttt
4Al + 2Pb(No3)2 → 4Al(No3) + Pb2
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Cobalt metal and copper ions
a. The metal known as cobalt forms cobalt III oxide and cobalt II oxide when it react with oxygen.
b. The ionic charge on the metallic copper is +2
How cobalt III oxide is formedWhen cobalt II oxide reacts with oxygen, it results in the formation of cobalt III oxide.
The balanced chemical equation is given below.
4CoO + O₂ → 2Co2O₃
The ion on metallic is plus 2 charge, it is on this premise that the ionic charge on the metallic copper is confirmed as +2.
So therefore, when cobalt is combines with air, it forms a binary compound known as cobalt II oxide and tricobalt tetroxide.
O₂
Complete question:
a. What compounds does cobalt metal forms?
b. What is the charge on copper ion?
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a sample of br2(g) takes 46.0 min to effuse through a membrane. how long would it take the same number of moles of ar(g) to effuse through the same membrane?
From the equation of Graham's law of diffusion of gases, it would take the same number of moles of Ar(g) 23 minutes to effuse through the same membrane.
What factors affect the rate of diffusion of gases?The rate of diffusion or effusion of gases is affected by temperature, concentration, pressure, and the molecular weight of the gas.
The gas law that describes how the molecular weight or vapor density of a gas affects the rate of diffusion is Graham's law of diffusion of gases.
Mathematically, Graha's law of diffusion of gases is given below as follows:
R₁ / R₂ = √(M₂ / M₁) or T₁ / T₂ = √(M₁ / M₂)
where;
R₁ is the rate of diffusion of gas 1
T₁ is the time of diffusion of gas 1
M₁ is the molecular weight of gas 1
R₂ is the rate of diffusion of gas 2
T₂ is the time of diffusion of gas 2
M₂ is the molecular weight of gas 2
Substituting the values in the second equation:
The molecular weight of Br₂ = 160 g/mol
The molecular weight of Ar = 40 g/mol
46 / T₂ = √(160 / 40)
T₂= 46 / 2
T₂ = 23 mins
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In which step of the four-stroke engine cycle does the car release CO₂, H₂O, and CO?
O A. Combustion and expansion
O B. Compression and ignition
O C. Exhaust
O D. Air and fuel intake
Answer:
Explanation:
In which step of the four-stroke engine cycle does the car release CO₂, H₂O, and CO?
O C. Exhaust
a sample of a material has 20002000 radioactive particles in it today. your grandfather measured 40004000 radioactive particles in it 6060 years ago. how many radioactive particles will the sample have 60 years60 years from today?
The remaining mass of radioactive elements with 60 years of half-life is 1000 particles.
We need to know about the half-life of the radioactive elements to solve this problem. The radioactive element will decay over time and follow the equation
N = No(1/2)^(t/t'')
where N is the final quantity, No is the initial quantity, λ is the decaying constant, t is time and t'' is the half-life of a radioactive element.
From the question above, we know that
t'' = 60 years
No = 2000 particles
t = 60 years
Calculate the remaining mass
N = No(1/2)^(t/t'')
N = 2000 x (1 / 2)^(60 / 60)
N = 1000 particles
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Please read the following direction I need it ASAP!!!
HIghschool Earth & Physical Science (9th Grade)
The correct answer about Liquids A and B is:
Liquid B has a lower boiling point because more water evaporated, therefore the interactions between the particles in Liquid B are weaker than the interactions in Liquid A; option D
What is the boiling point of a liquid?The boiling point of a liquid is the temperature at which the molecules of the liquid change phase from liquid to gas.
At the boiling point of a liquid, the molecules of the liquid acquire enough energy to break free of the intermolecular forces between the molecules.
The lower the boiling point of a liquid, the lesser the strength of the intermolecular forces between the molecules,
Hence liquids with lower boiling points evaporate faster.
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A scientist placed a sample of lithium into a container of water. The scientist observed the lithium floating and making a buzzing sound as gas bubbles were forming around it. Smoke and steam were released as well. Which conclusion is BEST supported by this observation?
A.
Water was vaporized.
B.
Dissolved gases were released.
C.
A chemical change took place.
D.
The lithium was dissolved by the water.
Answer:
Explanation:Again, this is an example of a physical change. Figure 3.6. 1: Ice melting is a physical change. When liquid water (H2O) freezes into a solid state (ice), it appears changed; however, this change is only physical, as the composition of the constituent molecules is the same: 11.19% hydrogen and 88.81% oxygen by mass.03-Sept-2019
A sample consists of ethanol and water.
Ethanol has a density of 0.79 g/mL.
Which liquid will float on top of the sample
- the ethanol or the water?
Density of water is 1g/cc whereas ethanol is 0.79g/cc
So density of ethanol is less than water hence ethanol will float on water
What is density ?
density is the mass of a material substance per unit volume. d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density. For instance, while Earth has a density of 5.51 grammes per cubic centimeter, water has a density of 1 grammes per cubic centimeter. Another way to state density is in kilograms per cubic meter (in meter-kilogram-second or SI units)
Density of water is 1g/cc whereas ethanol is 0.79g/cc
So density of ethanol is less than water hence ethanol will float on water
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Can I find a tutor help me wit this question?
Chemistry =>Introduction to Chemistry => Scientific Method
A scientific method corresponds to a methodology to obtain new knowledge.
We must start from an idea, an assumption of how a compound or a process behaves, this is our hypothesis.
Following this, we must identify what can affect our process, what are the variables, and what will be the response variable, for this we carry out an experiment.
Once the experiments have been carried out, we must analyze the results, draw conclusions as to why the behavior occurs, and if our hypothesis is true or not.
It is useless for us to obtain new knowledge if we do not share it, We have to share the results, in this way other people can start from that knowledge to create another,
Therefore, the answer will be:
1. Make a hypothesis
2. Conduct an experiment
3. Analyze the experiment data
4. Communicate the results
Consider a 3-atom molecule a-b-a for which b has a total of only two valence electrons. If you assume that b is a group ii metal, what is the bond angle for a-b-a? please answer in degrees to the nearest whole number.
Consider a 3-atom molecule a-b-a for which b has a total of only two valence electrons if you assume that b is a group ii metal, then the bond angle for a-b-a is 180 degree
Valence electron is the s and p electron in the outermost shell and electron present in the inner shell are core electron and according to the valence shell electron pair repulsion theory and we that bond angle that an atom has with its neighbor which also called dihedral angle a group II metal has two valence electron there it can form only single bond then b will not have any lone pair and the ones digit in the group number is the number of valence electron and 180 degree bond angle means the atom are connected in straight line called 180 degree bond
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Summarize the process of anabolism.
The process of anabolism is a metabolic pathway in which one or more molecules are used to synthesize more complex compounds.
What is anabolism?Anabolism refers to the chemical metabolic reactions that occur in biological systems which are aimed at generating complex molecules from simpler ones. This process is different from catabolism, which involves the release of energy to be used in the anabolic process.
Therefore, with this data, we can see that anabolism refers to the generation of complex molecules in biological systems by using the energy generated by catabolic reactions in the body.
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How many molecules of sucrose are
in 205 g C12H22011?
(C12H22O11, 342.34 g/mol)
[?]
[? ]×10¹²] molecules C12H22O11
Coefficient (green) Exponent (yellow)
I
Enter
To begin with, sucrose is C12H22O11. Additionally, we must determine how many moles of sucrose there are in a pound of sucrose:
The moles of sucrose are 454g, 342.30g, mol1, and 1.33mol.
Is sucrose a good sugar to use?
Brief Summary According to a University of California, Davis study that was published in the Journal of Clinical Endocrinology and Metabolism, sucrose, the more "natural form of sugar," may be just as harmful to your health as HFCS.
Is sugar a healthy food?
Your body only receives sugar when you consume sucrose like soda or candy, and typically too much of it. The threat is present here. You run the risk of major health problems if you consume too much added sugar (fructose or sucrose) in your diet.
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When a hydrogen atom is covalently bonded to either oxygen, , or fluorine there will be an attraction between that hydrogen and a lone pair of on a nitrogen, oxygen, or fluorine atom on an adjacent molecule. This attraction is called a bond.
When a hydrogen atom is covalently bonded to either oxygen, , or fluorine there will be an attraction between that hydrogen and a lone pair of on a nitrogen, oxygen, or fluorine atom on an adjacent molecule. This attraction is called a bond nitrogen lone bond.
Lone pairs do they produce hydrogen bonds?Strong intermolecular interactions known as hydrogen bonds can develop between adjacent molecules. Between the covalently bound hydrogen atom of one molecule and the electron lone pair of a second molecule, hydrogen bonds are created.
Due to their strong electronegativity, only nitrogen, oxygen, or fluorine atoms may be used in this process. These three atoms have extremely high electronegativity, which makes it simple for them to draw the electron from the hydrogen atom and establish hydrogen bonds.
Atoms within a molecule are held together by intramolecular forces. There are forces between molecules known as intermolecular forces.
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Specify the particular process(es) that would be altered, and EXPLAIN how this/these process(es) would be altered. (Hydrologic Cycle)
The hydrologic cycle to be altered because of global warming due to increasing green house effect.
What is global warming?Global warming is the term used to describe the phenomena of a gradual increase in temperature close to the earth's surface. This trend has been noticed during the past century or so. This change has affected the pattern of the earth's climate. Scientists have offered proof that the earth's temperature is gradually rising, even if the concept of global warming is still up for debate.
Global warming has a number of causes that are harmful to people, plants, and animals.
What is Green house effect?A glass-enclosed structure called a greenhouse is used to grow plants. The sun's beams warm the greenhouse's air and plants. The greenhouse must be warmed in order for the plants to flourish because the heat that is trapped inside is unable to escape. The earth's atmosphere is identical.
The greenhouse gases in the earth's atmosphere absorb the heat throughout this process. Because of this, the earth's surface becomes warmer, which enables life to exist on the planet.
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you cool a liquid mixture of acetic acid and water that has a mole fraction of water of 0.9. as you begin to freeze the acetic acid/water mixture, what happens to the mole fraction of water in the liquid phase?
The mole fraction of water decreases because, at this starting mole fraction, solid water forms before solid acetic acid.
What is mole fraction ?
Mole fraction represents the number of molecules of a particular component in a mixture divided by the total number of moles in the given mixture. It’s a way of expressing the concentration of a solution.
The amount fraction is another name for the mole fraction. It is the same as number fraction, which is calculated by dividing the number of molecules in a constituent (Ni) by the sum of all molecules. Instead of using a Roman x, the lowercase Greek letter chi is occasionally used to represent the mole fraction. The IUPAC recommends the letter y for gas mixtures.
Because it does not include the name of the unit mole, the National Institute of Standards and Technology of the United States prefers the phrase amount-of-substance fraction to mole fraction.
Molar concentration is a proportion of moles to volume, whereas mole fraction is a ratio of moles to moles.
The mole fraction of water decreases because, at this starting mole fraction, solid water forms before solid acetic acid.
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[cu2 ] concentration in a copper-silver electrochemical cell is 0.1m at 25 oc. if the total cell potential is 0.422v, what is the [ag ] concentration?
how America can best accelerate its transition to renewable energy
500-1000 words essay
America can best accelerate its transition to renewable energy by :
The effort to eliminate carbon emissions on a net basis by 2050 will accelerate innovation and create the largest reallocation of capital.Rising geopolitical tensions have targeted the focus of industries on energy security, reliability and sustainability.Companies and governments are facing pressures to provide more oil and gas supply along with accelerating the energy transition.Renewable digital technologies are emerging with a game-changing take on artificial intelligence, machine learning and automation.Need to accelerate the transition of national net-zero energy ecosystems.Transformation on this scale will require a combination of vision, imagination for companies and investors to achieve their decarbonization ambitions.To know more about renewable energy, refer
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Why do you think that we used the metal salts (solutions) instead of the pure metals?
Answer:
the metal salts are more stable and less reactive than the pure metals
Explanation:
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A chemical reaction combines the metal sodium (NA) and the gas chlorine (cl2) to form sodium chloride, commonly known as table salt (nacl) why does this produce have different properties from the reactants
When a chemical reaction happens, the atoms in the reactants are rearranged to create compounds with various chemical characteristics. Although identical atoms are present in both the reactants and the products, sodium chloride was produced by rearranging the atoms in the reactants. The reactants lacked sodium chloride.
Sodium is a soft, silver-colored metal that may be sliced with a knife. With water, pure sodium metal reacts violently (and even explosively), creating sodium hydroxide, hydrogen gas, and heat.
2Na(s) + 2H₂O(l) ⟶ 2NaOH(aq) + H₂(g)
Chlorine is a poisonous yellow-green gas with a pungent smell.
But when sodium and chlorine combine, they create sodium chloride, or table salt, which is known to practically everyone in the world.
2Na(s) + Cl₂(g) ⟶ 2NaCl(s)
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helium condenses to a liquid at 4.224 k under atmo- spheric pressure and remains a liquid down to the abso- lute zero of temperature. (it is used as a coolant to reach very low temperatures.) the vapor pressure of liquid helium at 2.20 k is 0.05256 atm. calculate the volume occupied by 1.000 mol helium vapor under these condi- tions and compare it with the volume of the same amount of helium at standard temperature and pressure.
If we assume that helium acts as an ideal gas, we can calculate that 1.000 mol of it will take up 3.43 L, which is 6.53 times less than its volume at standard conditions.
Assuming that helium behaves like an ideal gas in both cases, we can calculate the volume at 2.20 K using the ideal gas equation:
PV = nRT
P - the pressure exerted by the gas (0.05256 atm)
V - the volume of the gas
n - number of moles of the gas (1.000 mol)
R - universal gas constant (0.08206 L*atm/K*mol)
T - temperature (2.20 K)
If we rearrange the equation, we get:
V = nRT/P
Now we plug in the known values:
V = 1.000 mol * 0.08206 L*atm/K*mol * 2.20 K / 0.05256 atm
V = 3.43 L
At standard conditions (273 K, 1 atm), 1 mol of an ideal gas has a volume of 22.4 L, so the volume at described conditions is 22.4 L / 3.43 L = 6.53 times smaller than at standard conditions.
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Calculate the mass of water of hydration lost and the mass of dehydrated salt remaining (CuSO4(s)).
According to the concept of molar mass, mass of water of hydration lost is 90 g/mole and mass of dehydrated salt is 159.68 g/mole as the mass of copper sulfate pentahydrate is 249.68 g/mole.
What is molar mass?Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.
Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.
Copper sulfate along with water of hydration has mass of 249.68 g/mole.On heating , the mass of water of hydration lost =90 g/mole
∴mass of dehydrated salt=249.68-90=159.68 g/mole.
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Name the two molecular compounds you think would have the same mass.
The oxides of 'C' and 'N' are the two molecular compounds having the same mass i.e. CO₂ and N₂O.
To calculate the molecular weight of a molecule, individual atomic masses of various elements are added.
Given: The atomic mass of 'C' = 12u
The atomic mass of 'N' = 14u
The atomic mass of 'O' = 16u
∵Molecular weight of CO₂ = 12+16+16 = 44g/mol
The molecular weight of Carbon Dioxide is 44g/mol.
∵Molecular weight of N₂O = 14+14+16 = 44g/mol
The molecular weight of Nitrous Oxide is 44g/mol.
Molecular compounds having the same mass are known as Isobars. Isobaric properties are:
Same physical behaviorDifferent chemical behaviore.g.: Ar and Ca
element x has two naturally occurring isotopes. if 72% of the atoms have a mass of 85 amu and 28% of the atoms have a mass of 87 amu, what is the atomic mass of element x?
The atomic mass of element x is 85.56 amu if 72% of the atoms have a mass of 85 amu and 28% of the atoms have a mass of 87 amu
The atomic mass of an element can be determined by first multiplying the percentage of its isotopes by their atomic mass and then adding the resultants together.
As 72% of the atoms have a mass of 85 amu and 28% have a mass of 87 amu, therefore
atomic mass of element x = (72% × 85) + (28% × 87)
atomic mass of element x = (72/100 × 85) + (28/100 × 87)
atomic mass of element x = (0.72 × 85) + (0.28 × 87)
atomic mass of element x = 61.2 + 24.36
atomic mass of element x = 85.56 amu
Therefore the atomic mass of element x is calculated to be 85.56 amu.
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A volcano has recently irrupt it and wiped out most of the wildlife will leave it on the volcano how are birds in the area going to be impacted
A volcano has recently irrupt it and wiped out most of the wildlife will leave it on the volcano and it will create huge impact on birds in the area going to be impacted as the volcano irrupt heat will generate and it will cause increase in the temperature that will change the life style of the various birds living in that area.
What is volcano?Volcano is defined as a rupture in the part of the crust of the planetary mass of the object generally Earth, which allows the hot lava as well as ash, including the gases that has been escaped from the chamber of the magma.
Therefore, A volcano has recently irrupt it and wiped out most of the wildlife will leave it on the volcano and it will create huge impact on birds in the area going to be impacted as the volcano irrupt heat will generate and it will cause increase in the temperature that will change the life style of the various birds living in that area.
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