What role do producers play in the carbon cycle?

Which of the following are often involved in a biogeochemical cycle?

The burning of fossil fuels releases which of the following gases into the atmosphere?

Which element is the main component of all life?

During which step of the water cycle is water changed from a vapor state to a liquid state?

How do trees affect the water cycle if they are removed?

Carbon dioxide enters the atmosphere through each of the following processes except one. Which one?

Water can enter the atmosphere which two ways?

Which of the following is needed for the nitrogen cycle?

Where is the largest reservoir of carbon on earth located?

Marine organisms such as coral and shellfish have carbon in their bodies in which of the following forms?

Carbon in the bodies of marine organisms often is changed into which of the following forms?

Which of the following is the source of energy for the water cycle?

In what form is most carbon released into the atmosphere?

The carbon cycle works in conjunction with which of the following?

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