G9 Science Review

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Across
  1. 2. The body's ability to maintain a stable internal environment
  2. 3. Chemical messengers produced by the endocrine system
  3. 4. A substance that donates hydrogen ions in solution
  4. 8. The force that pulls objects toward Earth
  5. 9. The amount of substance containing 6.02 × 10²³ particles
  6. 10. The body system that fights diseases
  7. 12. The bending of light as it passes between materials
  8. 14. The tendency of an object to resist changes in motion
  9. 15. The process of breaking food into smaller molecules that can be absorbed
  10. 18. The force that opposes motion between surfaces
  11. 19. Newton's Third Law states that every action has an equal and opposite _____
Down
  1. 1. The process by which oxygen enters the blood and carbon dioxide leaves it
  2. 5. The distance between two identical points on a wave
  3. 6. The smallest unit of an element that retains its properties
  4. 7. The rate at which velocity changes
  5. 11. The spreading of waves after passing through a gap or around an obstacle
  6. 13. The bouncing of a wave off a surface
  7. 16. An atom of the same element with a different number of neutrons
  8. 17. The number of waves passing a point each second