Across
- 2. dioxide: Gas responsible for the greenhouse effect
- 4. Space that is devoid of matter
- 6. plates: Large, moving pieces of Earth's crust that interact with each other at plate boundaries
- 8. Layer where the aurora borealis occurs
- 10. Most abundant gas in Earth's atmosphere
- 13. Molecule that protects Earth from harmful UV radiation
- 14. vapor: Gas that plays a role in the water cycle and weather
- 17. lights: Same as northern lights, but in the southern hemisphere
- 18. Layer of gases surrounding Earth
- 19. Layer where meteors burn up
- 20. Zone of Earth where life exists
Down
- 1. debris: Small particles and debris in space
- 3. Energy emitted in the form of waves or particles
- 5. light: Electromagnetic radiation with a shorter wavelength than visible light
- 7. Gas necessary for human and animal respiration
- 9. Gas that makes up a small portion of Earth's atmosphere
- 11. Layer closest to Earth's surface where weather occurs
- 12. Layer where the ozone layer is located
- 15. lights: Phenomenon caused by charged particles from the sun colliding with particles in the Earth's atmosphere
- 16. Bright streaks of light in the sky caused by meteoroids entering Earth's atmosphere