Science cross word

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Across
  1. 4. The ability to do work
  2. 6. A substance that can not be broken down
  3. 8. The basic unit for anything living
  4. 11. This rock forms when magma cools
  5. 13. Substances with the properties of luster and conductivity
  6. 14. The control center for the cell
  7. 15. The energy of movement
  8. 16. How far something travels in a certain time
  9. 17. A force that pulls everything to the ground
  10. 19. How much mass is in an object
  11. 20. A living organism
Down
  1. 1. A organism without a nucleus
  2. 2. A organism with a nucleus
  3. 3. anything that can be used as a source of energy
  4. 5. The cycle of rocks constantly changing
  5. 7. An idea that can be supported with data
  6. 9. The energy of motion
  7. 10. This uses direction and speed
  8. 12. An organism that makes its own food
  9. 18. A non-living organism