Across
- 2. meteors burn up here
- 6. contains charged ions
- 8. after you leave the Earth's atmosphere, you go here
- 10. densest layer
- 11. decreases with altitude
- 12. satellites orbit here
- 13. layer that protects us from the Sun's rays
- 14. occur in the thermosphere
- 15. occurs in the troposphere
Down
- 1. planes fly here
- 3. weather balloons fly here
- 4. international space station orbits here
- 5. most abundant element in the atmosphere
- 7. decreases with altitude
- 9. where one layer ends and another layer begins