Geothermal energy

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Across
  1. 4. Natural heated water found underground
  2. 5. The center layer of the Earth
  3. 6. Deep holes drilled into the Earth
  4. 8. Something geothermal plants produce
  5. 9. Geothermal energy can help reduce this type of pollution
  6. 12. Underground rock melted by heat
  7. 13. A cleaner type of energy source
  8. 15. Hot vapor used in geothermal plants
  9. 17. Harmful gases released into the air
  10. 18. Hot liquid found below Earth’s surface
  11. 19. Buildings can use geothermal energy for this
Down
  1. 1. The process of making electricity
  2. 2. A natural opening that may release hot steam
  3. 3. Type of power plant that uses Earth’s heat
  4. 7. Heat energy from inside the Earth
  5. 8. Main product created by geothermal power plants
  6. 10. Fossil fuel often replaced by geothermal energy
  7. 11. The Earth’s outer solid layer
  8. 14. Geothermal systems may sometimes cause small ones
  9. 16. Machine turned by steam to generate electricity