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Hemisphere - half of the globe
Atmosphere - the air that surrounds the earth
Lithosphere - All of the land of the earth
Hydrosphere - All of the water of the earth
The Nitrogen Cycle is the movement of nitrogen from the soil then to living things and finally back to the atmosphere.
Our bodies need nitrogen to make protein. Protein is used to make the muscles of your body.
78% of the atmosphere is Nitrogen
The Nitrogen Cycle:
Step 1: Bacteria in the soil absorb nitrogen from the air.
Step 2: Bacteria transforms nitrogen to nitrates.
Step 3: Plants absorb the nitrates.
Step 4: Plants turn the nitrates into proteins.
Step 5: Animals eat the plants.
Step 6: The Animal dies.
Step 7: Nitrogen is returned to the atmosphere as the animal decays.
The Oxygen Cycle:
Animals breathe in oxygen, use it for energy, and breathe out carbon dioxide
Plants take in carbon dioxide, use it for energy, and release oxygen.
The Water Cycle:
Step 1: Evaporation from the ocean
Step 2: Condensation into a cloud
Step 3: Precipitation onto the earth's surface
Step 4: Runoff into the ocean
Look here for a more information on the nitrogen cycle
Look here for a summary of all three cycles
Look here for a picture of the water cycle
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