The Major Systems of Earth

1234567891011121314151617181920
Across
  1. 2. dioxide: Gas responsible for the greenhouse effect
  2. 4. Space that is devoid of matter
  3. 6. plates: Large, moving pieces of Earth's crust that interact with each other at plate boundaries
  4. 8. Layer where the aurora borealis occurs
  5. 10. Most abundant gas in Earth's atmosphere
  6. 13. Molecule that protects Earth from harmful UV radiation
  7. 14. vapor: Gas that plays a role in the water cycle and weather
  8. 17. lights: Same as northern lights, but in the southern hemisphere
  9. 18. Layer of gases surrounding Earth
  10. 19. Layer where meteors burn up
  11. 20. Zone of Earth where life exists
Down
  1. 1. debris: Small particles and debris in space
  2. 3. Energy emitted in the form of waves or particles
  3. 5. light: Electromagnetic radiation with a shorter wavelength than visible light
  4. 7. Gas necessary for human and animal respiration
  5. 9. Gas that makes up a small portion of Earth's atmosphere
  6. 11. Layer closest to Earth's surface where weather occurs
  7. 12. Layer where the ozone layer is located
  8. 15. lights: Phenomenon caused by charged particles from the sun colliding with particles in the Earth's atmosphere
  9. 16. Bright streaks of light in the sky caused by meteoroids entering Earth's atmosphere