Science

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Across
  1. 3. When an object gets faster
  2. 6. An element that necessary for life to exist
  3. 8. Biggest organ in the human body
  4. 9. The building block of the universe
  5. 10. Unit for sound waves frequency
  6. 13. Nuclear process of splitting atoms
  7. 14. The powerhouse of the cell
  8. 15. An object that speeds up a reaction
Down
  1. 1. Name of the first dog in space
  2. 2. Unit for measuring force
  3. 4. Came up with the theory of relativity
  4. 5. Invisible force that pulls mass towards it
  5. 7. Blood vessels that carry oxygenated blood
  6. 11. An atom with an more neutron than protons
  7. 12. Important process that creates oxygen
  8. 14. Closest planet to the sun