Across
- 2. lives on the roots of plants and create nitrates
- 5. the process where plants absorb nitrates from the soil
- 8. 78% of the atmosphere
- 10. third layer of the atmosphere
- 12. contains the ozone layer
- 13. when water is filled with fertilizer and runs into waterways causing algae blooms
- 14. substance that is used to make shells
Down
- 1. a substance farmers use to put more nitrogen in the soil
- 3. the first layer of the atmosphere
- 4. causes nitrogen to mix with oxygen to create a usable compound
- 5. the height of an object
- 6. this process makes a usable compound
- 7. removing carbon from the atmosphere
- 9. a process used by plants to make sugars and oxygen
- 11. fourth layer of the atmosphere