Across
- 4. : Central part of Earth
- 5. : A section of Earth's crust that moves
- 6. : A mountain formed by eruptions of molten rock
- 9. : Naturally occurring solid substance with a crystal structure
- 13. : Path of Earth around the sun
- 15. : Movement of rock particles by wind, water, or ice
- 16. : Layer of Earth below the crust
- 18. : The uppermost layer of Earth
- 19. : Shaking of Earth's surface due to plate movement
- 20. : An imaginary line around which Earth spins
Down
- 1. : Preserved remains of ancient organisms
- 2. : Laying down of sediment by wind, water, or ice
- 3. : A large mass of moving ice
- 7. : Layer of gases surrounding Earth
- 8. : Small particles of rock or organic material
- 10. : Molten rock beneath Earth's surface
- 11. : Study of Earth's structure and history
- 12. : Breaking down of rocks into smaller pieces
- 14. : Refers to the movement of Earth's plates
- 17. : Large ocean wave caused by an undersea earthquake