Unit 1 Review (Part 2)

1. When water percolates through the soil, it is stored underground in aquifers. This is known as ______________.
5. Combustion releases ______________ into the atmosphere.
7. The only process to absorb carbon dioxide from the atmosphere.
8. The process of water traveling through the soil.
9. In the phosphorus cycle, plants absorb ________ from the soil.
12. ______________ is not usable for plants so it must be converted to usable forms of nitrogen in the nitrogen cycle.
14. The type of organism that carries out the processes in the nitrogen cycle.

2. The process of nitrogen gas being converted to ammonia or ammonium.
3. Phosphorus stored in rocks go through the process of __________ for phosphates to be released into the soil or water.
4. The process in the nitrogen cycle that converts nitrates to atmospheric nitrogen gas.
6. Plants, animals, and decomposers go through this process to release carbon dioxide into the atmosphere.
8. In the water cycle, water goes from the atmosphere back to Earth through ___________.
10. Phosphorus is found most commonly in __________ in the soil.
11. Through the process of _____________, water goes from the oceans to the atmosphere.
13. The process of phosphates traveling into bodies of water from the soil through the percolation of water.