nitrogen cycle

This effectively eliminates the first stage of the nitrogen cycle.

It is an important part of the nitrogen cycle.

Animals, and other living things that do not make their food, depend on the nitrogen cycle indirectly.

This process is known in the aquarium hobby as the nitrogen cycle.

The diagram above shows how these processes fit together to form the nitrogen cycle.

The nitrogen cycle is an important process in the ocean as well.

Understanding the nitrogen cycle is essential for the keeping of any aquatic life.

With this knowledge it was then possible to outline the global nitrogen cycle.

C1 The hand of humanity lies heavy on the nitrogen cycle.

This conversion is an important and crucial stage in the nitrogen cycle.