Science

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Across
  1. 1. How fast an object moves.
  2. 6. A substance made of two or more different atoms joined together.
  3. 7. The hard structure that supports and protects the body.
  4. 11. When substances change to make new substances.
  5. 12. Tissue that contracts to produce movement.
  6. 13. Two or more atoms joined together.
  7. 15. An object’s tendency to stay still or keep moving.
  8. 16. The force that pulls objects toward each other, especially toward Earth.
  9. 18. The organ that pumps blood throughout the body.
  10. 19. The change in an object’s position over time.
  11. 20. A force that slows down moving objects.
Down
  1. 2. A negatively charged particle that moves around the nucleus.
  2. 3. The smallest particle of an element.
  3. 4. Organs that bring in oxygen and remove carbon dioxide.
  4. 5. A particle with no charge in an atom’s nucleus
  5. 8. A push or pull that can change an object’s motion.
  6. 9. The rate at which an object’s speed changes.
  7. 10. A substance made of only one kind of atom.
  8. 14. A positively charged particle in an atom’s nucleus.
  9. 17. The control center of the body.