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Across
  1. 1. dead animals and plants
  2. 3. precious stone
  3. 4. energy
  4. 6. smallest
  5. 8. object gives out natural light
  6. 9. layer of earth
Down
  1. 1. present in soil
  2. 2. made of multiple simple machines
  3. 5. path
  4. 7. energy