Science

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Across
  1. 2. layer of atmosphere closest to earth
  2. 4. 2nd closest atmosphere layer
  3. 7. speed and direction
  4. 9. kinetic+potential=______
  5. 11. a machine to make work easier
  6. 14. reproduction with 2 parents
  7. 15. body system to digest food
  8. 16. cell splitting into 4 new different cells
  9. 17. condition of Earths atmosphere
Down
  1. 1. transfer of water to plants
  2. 3. still energy
  3. 5. 3rd closest atmosphere layer
  4. 6. exerted on an object
  5. 8. any living thing
  6. 10. powerhouse of the cell
  7. 12. reproduction without sexual contact
  8. 13. moving energy