Across
- 3. age: Cold era in history
- 5. Released gases
- 8. Lowest air layer
- 10. Blocks UV rays
- 11. Daily forecast
- 15. Auroras happen here
- 17. Niño: Warm ocean event
- 18. Niña: Cool ocean event
- 19. Element in coal
- 20. Most common gas in air
- 21. Ozone layer location
- 22. Air around Earth
Down
- 1. Wobble of Earth’s axis
- 2. Path around the Sun
- 4. Long-term weather
- 5. Top air layer
- 6. gas: Traps heat in the air
- 7. Greenhouse gas from decay
- 9. Nutrient in soil
- 12. Water cycle
- 13. Shape of an orbit
- 14. Where meteors burn
- 16. Earth's tilt