Across
- 5. traces of animals or plants
- 7. plates slip past each other
- 8. when plates move
- 12. a structure that forms when molten material reaches the surface
- 13. large, explosive volcano
- 15. shearing occurs at transform boundaries
- 16. a break in the rock of Earth's crust or mantle
- 17. plates move away from each other
- 18. an area of the mantle where hot rock rises upward
- 20. a sudden and violent shaking of the ground
Down
- 1. two plates move together
- 2. continents slowly moving over time
- 3. a force that acts on a rock to change its shape or volume
- 4. vibrations that travel through Earth carrying energy
- 6. one plate subducts under the other
- 9. oldest layer on bottom, youngest on top
- 10. compression occurs at convergent boundaries
- 11. tension occurs at divergent boundaries
- 14. what magma is called when it reaches Earth's surface
- 19. Earths crust is broken into these