astronomy

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Across
  1. 2. The approximate age of the earth.
  2. 3. The formula for breathable oxygen
  3. 5. wave caused by earthquakes
  4. 7. average distance in plate movement in a year
  5. 8. month in which the earth is closest to the sun
  6. 9. point in a planets orbit farthest from the the sun
  7. 11. instrument that measures seismic activity.
  8. 13. name of the only star in our solar system
  9. 14. planet furthest away from the sun
  10. 15. higher frequency radio waves
  11. 16. study of plate movement
  12. 18. current north star
  13. 19. source for water on earth
  14. 20. primary green house gasses
  15. 22. that leads you to the north magnetic pole.
  16. 23. largest planet in our solar system
Down
  1. 1. particle found in the outer van allen belt.
  2. 3. tilt of the earths axis
  3. 4. time for 1 revolution around the earth.
  4. 6. planet closest to the sun
  5. 7. chemical zone that destroys the ozone layer
  6. 8. most abundant gas in earths atmosphere
  7. 10. the process by which life produced oxygen
  8. 12. hottest planet in our solar system
  9. 13. average distance from the earth to the sun
  10. 14. study of seismic waves
  11. 16. chemical formula for ozone
  12. 17. the sun, what is the brightest star seen from earth in the sky
  13. 18. current north star
  14. 20. primary metals found in earths core
  15. 21. Type of pollution formed by car exhaust and burning coal.