Earth Systems Unit Review

7. This is a more usable form of nitrogen for organisms
8. everything is made up of this.
12. The Earth is an example of this kind of system.
13. This process that plants do introduces carbon into the cycle.
14. All of the water on Earth's surface.
16. This molecule makes up protein, fat, and carbohydrates in organisms.
17. The most abundant gas in the atmosphere.
19. Carbonate does not break down easily and overtime forms this type of rock.

1. Members of the ecosystem that break down dead matter.
2. The second most abundant gas in the atmosphere.
3. The process that breaks down rocks and minerals, and introduces phosphorus into the cycle.
4. A mixture of gases above the surface of the Earth.
5. Most living beings on Earth require this.
6. Every living thing is contained in this sphere.
9. The solid part of the Earth that is made up of rock, loose rock, and soil.
10. The element that is important for building bones and teeth.
11. All organisms need this to build new cells and make protein.
15. ____________ breaks apart the nitrogen molecules in the air which combine with oxygen to form nitrogen oxide.
16. The ocean is called this because it stores a lot of carbon.
18. This is where the Earth gets its energy from.