Energy-Apes

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Across
  1. 2. considered "clean" but releases toxic chemicals
  2. 4. clean renewable energy source
  3. 5. solar panels
  4. 6. most abundant in coal
  5. 8. uses machinery to produce energy
  6. 10. can be replenished within our lifetime
  7. 12. energy from heat from magma in earth
  8. 13. does not use machinery to produce energy
  9. 14. element to reduce to half its initial value
Down
  1. 1. recovering gas and oil from rock shale
  2. 3. densest for of coal
  3. 7. using steam left over to produce heat.
  4. 9. store excess energy for later use
  5. 11. used in less developed countries for energy