Across
- 1. in a way that avoids danger
- 3. take air in and out of your lungs
- 6. the force that pulls things down
- 8. something that keeps you safe
- 9. go and find out more about a place
- 11. gathered together
- 14. almost no gravity; feeling nearly weightless
- 15. stay on top of water or air without sinking
- 17. made by putting parts together
- 18. vehicles (often spacecraft) that go back and forth
- 19. used again after being made into something new
- 21. stay alive
Down
- 2. only a small amount; not much
- 4. tools or things you need to do a job
- 5. used up for no good reason
- 7. a mountain that can shoot out lava, ash, and gas
- 10. a sudden shaking of the ground
- 12. alive right now
- 13. not easy
- 16. covered with a thin layer
- 20. bursts out, like lava from a volcano