Across
- 2. letting fields lie
- 3. a method used by farmers to help keep water from washing soil away
- 5. Dense, hard metallic element
- 7. something to separate metal in the ore from the other material's
- 9. minerals often found near volcanic areas
- 11. liquid version of fossil fuel
- 15. energy made from moving water
- 16. a mixture of several different gasses
- 19. hardened carbon-based fossil fuel
- 20. soft or shapable
- 22. a production place that breaks down certain materials
- 23. resources that can't be replaced easily
Down
- 1. chemical products derived from petroleum
- 2. remains of organisms that lived long ago
- 4. energy, such as electricity, that is generated directly from the wind
- 6. a place where water is collected and stored
- 8. A natural resource is something that is found in nature and can be used by people
- 10. another word for petroleum
- 12. a solid substance found naturally in the earth's surface
- 13. heat that comes from inside Earth
- 14. materials with usable amount of metal in them
- 17. resources that can be replaced easily
- 18. light, heat, and other forms of energy given off by the Sun
- 21. low growing crop