Environment

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Across
  1. 3. A place where an animal lives (6)
  2. 5. A black rock burned for energy (4)
  3. 7. Our planet (5
  4. 8. To use something again (5)
Down
  1. 1. A large natural stream of water (5)
  2. 2. A large area covered with trees (6)
  3. 4. The power from the sun (5)
  4. 6. To use less of something (6)