Across
- 3. _____ ice; forms when sea water freezes
- 4. tiny organisms that carry on photosynthesis
- 8. a strong, lightweight metal that is the most abundant metal in the earth's crust
- 10. mineral used to produce nuclear energy
- 12. ____ water; water stored beneath the surface of the earth
- 13. solid substance found naturally in the earth's surface
- 16. water returns to the sky through _____ and evaporation
- 18. concentrated area of a specific mineral
- 19. when water vapor cools and changes into a liquid
- 21. all of Earth's water
- 22. a material that has usable amounts of metal in it
Down
- 1. able to be dented or shaped
- 2. a resource that can be replaced relatively quickly
- 3. a process used to separate metal in ore from the other materials
- 5. water vapor in the air
- 6. ______ resources; all the materials available on Earth for man's use
- 7. a resource that is not able to be replaced quickly and can be used up
- 9. ____ shelf; floating ice sheet
- 11. factory that separates crude oil into different products
- 14. layer of sand, gravel, or bedrock that holds and moves ground water
- 15. how water falls to the earth
- 17. a valuable metal that often indicates wealth
- 20. _____ fuel; formed when the remains of plants and animals are buried quickly