Across
- 6. upper, solid layer of Earth
- 7. a measurement of force
- 8. plates spread apart
- 9. study of space
- 13. testing a hypothesis
- 14. heat transfer through liquid or gas
- 17. energy producing object made of hydrogen and helium
- 18. heat from below the surface
- 19. splitting or combining of atoms
Down
- 1. moving energy
- 2. inner layer of Earth
- 3. a body revolving a star
- 4. magma escaping Earth
- 5. an educated guess
- 10. dying star, biggest explosion known in universe
- 11. energy due to position or condition
- 12. how far it travels in a certain amount of time
- 14. heat transfer through touch
- 15. where stars form
- 16. plates come together