Earth Resources

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Across
  1. 3. Energy obtained from underground steam
  2. 6. Energy obtained from falling water
  3. 7. substitute for dwindling petroleum supplies
  4. 10. law that protects the water
  5. 13. Energy obtained from the air
  6. 14. pollution coming from unknown location
  7. 15. Can be replenished over a short time
  8. 16. energy provided by the sun
  9. 18. law that protects the air
  10. 19. pollution coming from a known location
Down
  1. 1. primarily used by power plants
  2. 2. process that conserves forest resources
  3. 4. Hydrocarbons used as fuel
  4. 5. Energy obtained from the sea
  5. 8. energy obtained from radioactive materials
  6. 9. water that carries non point source pollution
  7. 11. takes millions of years to form and accumulate
  8. 12. careful use of resources
  9. 17. it forms from the remains of plants and animals