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