The Nitrogen Cycle

3. Bacteria that convert atmospheric nitrogen into biological compounds.
5. The process of turning ammonia into nitrate, performed by autotrophic bacteria and Archaea.
6. A biogeochemical process, where nitrogen is converted into different forms.
7. The second step of Nitrification.
9. The type of denitrification that occurs in soil.
11. The most common industrial method of nitrogen fixation.
12. When the nitrogen in dead organisms is broken down by bacteria and decomposers into ammonia.

1. Converts nitrogen into usable forms.
2. When plants and animals use nitrogen to grow and sustain themselves.
4. ______________ can break the bonds of atmospheric nitrogen because of its high temperature.
8. The type of denitrification that occurs in marine ecosystems.
10. The process by which nitrogen is released back into the atmosphere as a gas.