Across
- 4. Any basic unit of matter and energy
- 6. A relatively hard naturally occurring mineral material
- 8. Small usually rounded stones worn by the action of water
- 9. Related to, or derived from living matter
- 12. The expanse of salt water that covers most of the earth's surface and surrounds land masses
- 13. The process where liquid changes to a gas or vapor
- 14. Flat low lying plain that forms from the deposits of sediments at the mouth of a river
- 16. Solid material that is moved and deposited in a new location
Down
- 1. A covering of minute ice crystals on a cold surface
- 2. A natural movement of air at any velocity
- 3. The laying down of sediment carried by wind, flowing water, the sea, or ice
- 4. A naturally occurring sequence of changes of properties of an object or system
- 5. A substance composed of 2 parts hydrogen and 1 part oxygen
- 7. To move in one direction continuously and easily
- 10. The force by which a planet or other body draws objects towards its center
- 11. The solid form of water produced by freezing
- 12. A loose granular material that results from the disintegration of rocks
- 15. A tall plant that can live for a very long time