Front

Where is carbon stored in the environment? Options: Fossil fuels, Wood of trees, Calcium carbonate (shells and bones), All of the above

Back

All of the above

Front

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

Back

Denitrification

Front

What happens during the process of nitrogen-fixation?

Back

Free nitrogen turns into nitrogen compounds

Front

Where are nitrogen-fixing bacteria found?

Back

Root nodules

Front

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

Back

agriculture and house hold runoff

Front

Which cycle is known as the "sedimentary" cycle because its reservoir is sedimentary rock? Options: Sulfur cycle, Nitrogen cycle, Phosphorus cycle, Carbon cycle

Back

Phosphorus cycle

Front

What is released by the weathering of rocks? Options: Carbon, Oxygen, Phosphorus, Nitrogen

Back

Phosphorus

Front

Identify the cycle pictured: The Water cycle, The Carbon cycle, The Nitrogen cycle, The Phosphorus cycle

Back

The Nitrogen cycle

Front

Identify the cycle pictured. Options: The Water cycle, The Carbon cycle, The Nitrogen cycle, The Phosphorus cycle.

Back

The Phosphorus cycle.

Front

How do animals get nitrogen?

Back

eating other organisms