Across
- 5. the temperature at which liquid turns into solid ice
- 7. harmful matter that makes water, soil or air dirty
- 8. an imaginary line around earth halfway between north and south poles
- 9. to change from a gas to liquid
- 10. to wear away
- 11. a material found in nature that is useful to humans
Down
- 1. a flowing stream of water within a larger body of water
- 2. to change from a liquid to a gas
- 3. bits of soil, sand, and rock that are picked up by rivers and dumped in the ocean
- 4. the gas form of water
- 6. a giant ice sheet that slowly out in all directions