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