Nature

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Across
  1. 1. natural satellite (4 letters)
  2. 5. part of a plant (4 letters)
  3. 7. Clues
  4. 9. water (3 letters)
  5. 10. body of saltwater (5 letters)
Down
  1. 1. gas for breathing (6 letters)
  2. 2. layer of gases surrounding Earth (10 letters)
  3. 3. Clues
  4. 4. tall, has leaves and branches (4 letters)
  5. 6. substance in leaves (11 letters)
  6. 8. of energy for life on Earth (3 letters)
  7. 11. known for building dams (6 letters)