Science Cross Word Puzzle

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Across
  1. 2. Force that pulls objects down (5)
  2. 6. Scientist who studied gravity (6)
  3. 7. Water cycle process (7)
  4. 8. Scientific tool (8)
  5. 9. Type of rock formed from lava (6)
  6. 11. Process plants make food (9)
  7. 13. Scientific method step (6)
  8. 15. Simple machine (4)
  9. 16. Human skeleton part (5)
  10. 18. Fossil fuel (5)
  11. 19. Human body system (6)
  12. 20. Basic unit of life (4)
Down
  1. 1. Weather phenomenon (7)
  2. 3. Ecosystem component (5)
  3. 4. Atmosphere layer (6)
  4. 5. Animal's home (5)
  5. 10. Plant part that absorbs water (5)
  6. 12. Natural disaster (7)
  7. 14. Planet we live on (5)
  8. 17. Type of energy from sunlight (6)