Across
- 4. Hot melted rock from a volcano
- 6. The top of a mountain
- 10. A scientist who studies living things
- 11. When the ground shakes
- 13. The air around Earth
- 14. From nature, not made by people
- 15. Not normal; different
- 16. More than others; particularly
- 18. A mountain that can erupt
- 20. Worried
Down
- 1. Tummy; where food goes
- 2. From the sea; ocean life
- 3. When a volcano explodes
- 5. Not safe
- 7. Very high land
- 8. Dirty air, water, or land
- 9. What makes a car or plane go
- 12. Place where boats stay safe
- 17. Keep safe
- 18. Low land between mountains
- 19. Very pretty