National Science Day Crossword Puzzle Competition Grade 7

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Across
  1. 3. Gas needed for respiration
  2. 4. Instrument that records earthquakes
  3. 6. Push or pull
  4. 8. system Controls body activities
  5. 9. Change in species over time
  6. 11. Powerhouse of the cell
  7. 13. Smallest unit of matter
  8. 14. dioxide Gas released during breathing
  9. 16. Wearing away of land by water or wind
  10. 17. Pumps blood through the body
  11. 18. Force that pulls objects toward Earth
  12. 22. Basic unit of life
  13. 23. Molten rock on Earth’s surface
  14. 24. Layer of gases around Earth
Down
  1. 1. Breaking down of rocks
  2. 2. energy Energy of motion
  3. 3. Largest body of salt water
  4. 5. Process by which plants make food
  5. 7. Green pigment in plants
  6. 10. energy Stored energy
  7. 12. Carry blood away from the heart
  8. 15. Molten rock beneath Earth
  9. 19. Speed in a direction
  10. 20. Sudden shaking of Earth
  11. 21. Rock formed from cooled magma