3B-Denitsa Peneva

1. the layer of the Earth where water is present
4. carbon dioxide is doing what to Earth's temperature
5. nature recycles matter through this
7. need nitrogen to grow
8. plants change carbon dioxide to carbohydrates through this process
10. plants and animals need it to make DNA, amino acids, and proteins
13. lightning does what to N2 atoms
17. travels between living and non-living parts of our planet
18. consume nitrogen with the plants they eat
19. bacteria changes nitrogen ammonia into nitrites and nitrates that plants can absorb during this process
20. traps heat
21. cannot be used directly as a nutrient by plants and animals

2. the process in which water from the leaves of plants/trees changes to water vapor
3. evaporation occurs because of this
6. nitrogen is changed into a usable form by lightning or what
9. the process where liquid water turns to water vapor
11. the largest reservoir of carbon on Earth
12. melting icecaps and drying lakes are a result of this
14. water stored under the surface of the Earth
15. 3% of Earth's water is fresh water and 2% of it is what
16. how much of the atmosphere is nitrogen