Biogeochemical Cycles

Where is carbon stored in the environment?

• Fossil fuels
• Wood of trees
• Calcium carbonate (shells and bones)
• All of the above

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Which is NOT a way that nitrogen compounds are added to the soil?

• Decay of dead organisms
• Denitrification
• Animal waste
• Nitrogen-fixation

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What happens during the process of nitrogen-fixation?

• Nitrogen compounds turn into free nitrogen
• Free nitrogen turns into nitrogen compounds

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Where are nitrogen-fixing bacteria found?

• In the soil
• Root nodules
• In dead things
• In the atmosphere

This process is responsible for most environmental problems of excess nitrogen and phosphorus entering streams, lakes and oceans.

• decomposition
• emissions from automobiles
• agriculture and house hold runoff
• photosynthesis

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Which of the following is known as the "sedimentary" cycle because its reservoir is sedimentary rock?

• Sulfur cycle
• Nitrogen cycle
• Phosphorus cycle
• Carbon cycle

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This is released by the weathering of rocks.

• Carbon
• Oxygen
• Phosphorus
• Nitrogen

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Identify the cycle pictured.

• The Water cycle
• The Carbon cycle
• The Nitrogen cycle
• The Phosphorus cycle

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Identify the cycle pictured.

• The Water cycle
• The Carbon cycle
• The Nitrogen cycle
• The Phosphorus cycle.

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How do animals get nitrogen?

• the atmosphere 
• eating other organisms
• rainwater
• lightning 

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