Across
- 3. where all the nitrogen in human and animal bodies come from
- 5. a plant that has bacteria living in it's roots that can fix nitrogen.
- 6. Helps nitrogen turn into a form that can be used by living organisms.
- 8. All the water on the earth's surface.
- 11. The areas of the surface between the hydrosphere and the biosphere.
- 14. also known as H2O
- 16. Water being released from clouds.
- 17. take up more carbon from the atmosphere than it gives up.
- 19. forms about 78% of the world's atmosphere.
- 20. A liquid's solid form
- 21. the process of turning from a liquid to vapor.
Down
- 1. the rock, minerals, and landforms of the surface and interior.
- 2. Coal oil, or natural gas formed from the fossilized, buried remains of plants and animals from millions of years ago.
- 4. The process where water vapor becomes liquid.
- 7. layers of gases surrounding, kept in by the earth's gravity.
- 9. The process a plant uses to make food.
- 10. when living organisms take up nitrogen
- 12. Represented by the element letter C.
- 13. The release of water from plant leaves.
- 15. water flowing over the land as surface water.
- 18. where most plants get nitrogen from.