chapter eighteen crossword puzzle

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Across
  1. 2. Production of electricity by water
  2. 4. Plant based material used as fuel
  3. 6. Thermal energy in Earth's crust
  4. 8. Use solar energy that heat a fluid
  5. 10. Use of the sun's energy for heating
  6. 11. Wind or solar power
Down
  1. 1. energy from the ocean
  2. 3. Reduce the amount of energy used
  3. 5. Prevention of wasteful use of energy
  4. 7. Do not deplete natural resources
  5. 9. Cell producing an electric current