This describes the movement of nitrogen throughout the atmosphere, lithosphere and biosphere.

Nitrogen gas is converted into a usable compound called nitrates by certain types of microorganisms.

Some bacteria take nitrogen out of compounds in the soil and change it back into nitrogen gas that is released into the atmosphere.

Plants roots absorb nitrogen containing nutrients in the soil.

A natural process in which substances are broken down to create energy.

Materials that slowly formed underground from the remains of plants and animals that died millions of years ago.

A natural process involving the eruption of hot gases and rock material from within Earth.

The process by which stones at the Earth's surface are broken down, either physically or chemically.

A reaction in which a substance burns in oxygen. This process releases carbon dioxide into the atmosphere.

The release of carbon dioxide that was once dissolved in water into the air

A natural process with plants in which carbon dioxide and water are converted into sugar.

A natural process in which pieces of rock and other matter settle out of water and are buried.

A natural process in which carbon dioxide from the atmosphere dissolves into water.

Cutting down large areas of trees. This puts more carbon dioxide and less oxygen in the air.

An increase in Earth's average global temperatures.

A natural process in which organic matter, like dead organisms, decompose or break down.

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