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