The paths of water, carbon, nitrogen, and phosphorous passing between the non-living env. and living organisms.

Water beneath the surface of the Earth

Water evaporating from leaves and moving to the atmosphere

Using oxygen to get energy from food releasing CO2

Burning, releases CO2 if it is carbon based.

When carbon locked away in limestone becomes available as the limestone becomes exposed

Combining nitrogen w/ hydrogen to form ammonia

Absorption and incorporation of nitrogen into organic compounds by plants

Production of ammonia by bacteria through decay

Production of nitrate from ammonia

Conversion of nitrate to nitrogen gas

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