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