The process by which cells break down glucose to release the energy they contain.

the process of burning something

a plant that live in a symbiotic relationship with a nitrogen-fixing bacteria

A fossil fuel in the gaseous state

the movement of carbon from the nonliving environment into living things and back

process by which plants and some other organisms use light energy to convert water and carbon dioxide into oxygen and carbohydrates such as glucose

Organisms that break down the dead remains of other organisms

Coal, oil, natural gas, and other fuels that are ancient remains of plants and animals.

The movement of nitrogen from the non living environment to the living environment and back

a combustible black or dark brown rock consisting mainly of carbonized plant matter.

top two layers of the earth

Bacteria that change dissolved ammonia into nitrite compounds or nitrites into nitrate compounds.

Part of the earth where living things exists

Bacteria that convert the nitrates in soil and release it back into the atmosphere.

bacteria that convert atmospheric nitrogen into ammonia

All the water on earth

the falling to earth of any form of water (rain or snow or hail or sleet or mist)

the formation of ammonia compounds in the soil by the action of bacteria on decaying matter