Across
- 2. An opening made by splitting or separation
- 4. An early aquatic relative of reptiles
- 6. Second layer of the Earth
- 7. A spring that dramatically spews hot water and steam
- 8. Molten erupted from a volcano
- 9. A long, narrow ditch
Down
- 1. Intense shaking of the Earth’s surface
- 3. Preserved remains from plants or animals in stone
- 4. Molten rock under the Earth’s surface
- 5. Large slab of solid rock