1. Nitrogen Cycle

2. Nitrogen is in the air. How does it get to the soil?
Lightning, bacteria, and decomposers can fix nitrogen into the soil
The roots of some bean plants can fix nitrogen into the soil
Nitrogen can get into clouds and fall as nitric acid in the rain

3. Nitrogen is in the soil. How does it get to other places?
Plants can absorb the nitrogen through their roots
Bacteria can convert the nitrogen back into a gas in the air
Nitrogen can be dissolved into the water

4. Where else can nitrogen go?
If animals eat plants, they get nitrogen from them
When plants and animals die or eliminate waste, they decompose and release nitrogen into the soil, air, or water
Fertilizer has nitrogen in it which it puts into the soil and plants
Fires can release nitrogen from plants and animals