Across
- 3. what human activity caused the dust bowl
- 5. the action of dividing or splitting something into two or more parts
- 7. the process of injecting liquid at high pressure into subterranean rocks
- 12. wind energy
- 14. excessive grazing which causes damage to grassland
- 15. uses dams to turn flowing water into electricity
- 16. land is turned gradually into a desert
- 17. a fuel derived directly from living matter
- 18. a form of energy resulting from the existence of charged particles
- 20. used to turn turbine generators
Down
- 1. Energy produced by the internal heat of the earth
- 2. Energy Geothermal energy used heat energy under the earth's surface to generate heat
- 4. energy from a source that is not depleted when used, such as wind or solar power
- 6. produced by hydrogen and oxygen fuel cell
- 8. energy released during nuclear fission or fusion
- 9. energy from the sun is called
- 10. Fossil fuel that develops beneath the earth's surface
- 11. energy which a body possesses by virtue of being in motion
- 13. a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms
- 17. organic matter used as fuel
- 19. a combustible black or dark brown rock consisting mainly of carbonized plant matter, found mainly in underground deposits and widely used as fuel