Across
- 4. A deep valley with straight sides.
- 7. Large pieces of land floating on the earth's surface
- 9. Between hills, where a river flows.
- 10. A high area of rocky land.
- 13. A small river.
- 14. When the ground shakes.
- 15. The wearing away of land.
Down
- 1. A dry piece of land.
- 2. The way earthquakes are measured.
- 3. Exploding mountains.
- 5. A large flat area of land.
- 6. Land surrounded by water on all sides.
- 8. The break down of rocks by wind, water and plants.
- 11. A high flat area of land
- 12. When a volcano explodes it is an _________.