Science vocab crossword puzzle

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Across
  1. 5. Cutting down trees
  2. 6. Ability to do work
  3. 9. Harmful substances in the environment
  4. 10. energy Energy that won’t run out
Down
  1. 1. Saving resources
  2. 2. energy Energy from splitting atoms
  3. 3. Heat energy from Earth
  4. 4. energy Energy that can run out
  5. 7. Energy from moving electrons
  6. 8. Fuels Fuels from ancient plants and animals