Science crossword

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Across
  1. 2. the amount of matter in a body
  2. 5. gas needed to breathe
  3. 6. ______ can never be created or destroyed
  4. 8. organ that pumps blood
  5. 10. ___ number of poles in a magnet
  6. 11. solid water
  7. 12. largest organ in the body
  8. 15. unit of distance
  9. 17. organs which help you to hear
  10. 18. organ which controls the body's actions
Down
  1. 1. mass divided by volume
  2. 2. powerhouse of the cell
  3. 3. what makes the skeletal system
  4. 4. energy from the sun
  5. 7. organ which helps you see
  6. 9. smallest particle
  7. 13. brain of the cell
  8. 14. fundamental unit of that composes all organisms
  9. 16. pure substance made of only one type of atoms