Science Crossword Puzzle

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Across
  1. 1. Only about 1% of fresh _____ is usable for humans.
  2. 3. What occurs when rain picks up pollutants and carries them downhill?
  3. 4. For biomass energy, you can burn matter such as _____ scraps.
  4. 7. What energy comes from earth’s interior?
  5. 8. Is when an atom splits, releasing energy.
  6. 10. The word _____ means to keep out of harm, injury, or destruction
  7. 12. About 20% of the land in the U.S.A is used for _____.
  8. 15. Geothermal energy needs to be collected in a _____ active area.
  9. 16. What water only makes up about 3% of the water on earth? _____ water.
  10. 17. These are deposits of minerals large enough to be mined for a profit.
  11. 18. Biomass energy is _____ efficient than fossil fuels.
  12. 19. This energy comes from the sun.
Down
  1. 1. This energy uses turbines on land to generate electricity.
  2. 2. For wind energy, you might use wind _____.
  3. 5. This energy is produced by burning organic matter.
  4. 6. Acid _____ occurs when nitrogen and sulfur compounds react with water and rains down.
  5. 9. Mineral _____ are mined from the land.
  6. 11. When nitrogen compounds react with sunlight, _____ is formed.
  7. 13. Solar _____ generate heat from the sun into electricity.
  8. 14. Solar panels would be pointless if _____ were always covering the sun.