Earth has several nutrient cycles that share similarities, but also differ. Connect each feature of a cycle that relates to the phosphorus, nitrogen, or carbon cycle. You may use cycles, and the features of the cycles, more than one time each.



Cycle

Nitrogen

Phosphorus

Carbon


Feature of Cycle

Excess present in fertilizers can upset the balance of the cycle


Mostly in a form unusable by organisms

Present in soil and organisms

Involved in respiration

Fixed by bacteria from the atmosphere

Often deposited on the ocean floor

Excess present in the atmosphere can upset the balance of the cycle