Across
- 4. - A fast-moving cloud of ash and gas.
- 6. - A tall volcano that explodes a lot.
- 7. - When plates slide past each other.
- 10. - A volcano that erupts with flowing lava.
- 13. - The solid outer layer of Earth.
- 17. - The hot rock that comes out of a volcano.
- 18. - A scientist who studies earthquakes.
- 19. - A crack where magma comes out.
- 20. - When two plates move apart.
Down
- 1. - A tool to measure earthquake strength.
- 2. - The hot layer of Earth below the crust.
- 3. - A place where magma rises through the crust to form volcanoes.
- 5. - Rising and sinking movement of hot material.
- 8. - When one plate goes under another.
- 9. - Big ocean waves caused by earthquakes.
- 11. - Hot melted rock under the ground.
- 12. - When the ground shakes.
- 14. - The slow movement of Earth's plates.
- 15. - The place above where an earthquake starts.
- 16. - A big hole left when a volcano collapses.