Across
- 4. the movement of the earth's crust
- 8. lets gas and liquid through it
- 9. a part of an atom with neutral charge
- 10. the result after a star collapses
- 12. a living object that can function on its own
- 13. when two atoms fuse together
- 14. the patha celestial body follows
Down
- 1. lowest temperature possible
- 2. someone who studies planets and space
- 3. a cloud of dust in space
- 5. erosion by friction
- 6. a celestial body made of rock
- 7. a rock formed by clay
- 8. a celestial body that orbits a sun
- 11. rain when gas emissions combine with water