STEM Crossword V

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Across
  1. 3. An animal that is active at night (8 letters)
  2. 5. A scientist who studies plants (10 letters)
  3. 9. The force that pulls objects toward Earth (7 letters)
  4. 11. The natural satellite of Earth (4 letters)
  5. 14. The layer of air around Earth (9 letters)
  6. 15. The process plants use to make food using sunlight (14 letters)
  7. 16. The part of the plant that grows underground (4 letters)
  8. 18. A solid form of water (3 letters)
  9. 19. A scientist who studies stars and planets (11 letters)
Down
  1. 1. A scientist who studies rocks (9 letters)
  2. 2. The largest planet in our solar system (7 letters)
  3. 4. A change of state from liquid to gas (10 letters)
  4. 6. The gas we breathe in (6 letters)
  5. 7. The star at the center of our solar system (3 letters)
  6. 8. A tool used to see tiny objects (9 letters)
  7. 10. An animal that hunts other animals for food (7 letters)
  8. 12. An animal that eats plants (9 letters)
  9. 13. The basic unit of life (4 letters)
  10. 17. The planet known as the Red Planet (4 letters)
  11. 20. A large body of saltwater (5 letters)