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Across 1. Community of living and non-living things that interact and live with each other. 3. A type of water energy. 6. It is a material like sand or silt that's carried and deposited by wind, or water. 8. Changes of direction of a stream. 9. A person who studies properties and effects of water. 12. Place where water drops from high above the ground. 13. Channel through which a natural stream of water runs . 15. A colorless, tasteless, and odorless gaseous gas that humans inhale. 16. Water flows downhill because ___________ of water get pulled down by gravity.

Down 2. The watershed of a continent. 4. Happens when there is too much rainfall. 5. Water flows in this direction. 7. Channels in soil made by water flowing down over it's surface. 10. The deeper part of a river or harbor. 11. A deep ditch or channel cut in the earth. 14. Vegetation sometimes acts like a ___________.