Cycles of Matter

Question 1

Which statements accurately describe the roles of decomposers in the carbon cycle? Select three options.

Revolt · Accepted Answer

Decomposers release carbon dioxide into the air as waste.; Decomposers break down the remains of dead plants and animals.; Decomposers return carbon compounds to the soil.

Question 2

What did you include in your response? Check all that apply.

Revolt · Accepted Answer

When fossil fuels like oil, coal, and natural gas are burned, carbon dioxide is released into the atmosphere as waste.; The clearcutting of forests for lumber and fuel also increases levels of carbon dioxide in the atmosphere because the trees can no longer remove carbon dioxide from the atmosphere for photosynthesis.; If trees are burned in order to be cleared, the burning processes release even more carbon dioxide into the air.

Question 3

Explain how human activity can affect the carbon cycle.

Revolt · Accepted Answer

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Question 4

What is free nitrogen?

Revolt · Accepted Answer

nitrogen that cannot be used by organisms

Question 5

How do plants obtain nitrogen?

Revolt · Accepted Answer

They absorb it through their roots.

Question 6

How does the use of fertilizer affect the nitrogen cycle?

Revolt · Accepted Answer

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Question 7

Once water vapor has been released into the atmosphere, it rises and cools, turning back into a liquid. What is this process called?

Revolt · Accepted Answer

condensation

Question 8

What occurs at stage A?

Revolt · Accepted Answer

Water evaporates from surfaces.

Question 9

Question 9

Revolt · Accepted Answer

nitrogen

Question 10

What did you include in your response? Check all that apply.

Revolt · Accepted Answer

When farmers harvest crops, a lot of the plant material is also removed. Little is left to decay and return nitrogen to the soil.; If the soil stays this way, it will start producing fewer crops.; Fertilizers contains the nitrogen compounds that are essential for plant growth. It can be used to replace the nitrogen in the soil to ensure the growth of healthy crops.

Cycles of Matter Answers

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