ES Final Exam Review Pt 2

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Across
  1. 2. telescope with a lens that bends light
  2. 4. added an extra day every fourth year to calendar
  3. 5. attractive force between two objects
  4. 6. telescope that uses a curved mirror
  5. 8. most popular theory for formation of moon
  6. 11. planet with a deep atmosphere; not very dense
  7. 12. a layer of crushed rock on the lunar surface
  8. 13. dark, large areas of lunar basalt
  9. 15. the process in which fluids move due to temp
  10. 17. movement of a body around another
  11. 18. developed the heliocentric theory
Down
  1. 1. tendency for a body to remain in motion
  2. 3. point at which Earth is closest to the sun
  3. 7. spin of a body on its axis
  4. 9. system created for measuring long time periods
  5. 10. bowl-shaped depressions on the moon
  6. 14. study of the universe
  7. 16. an instrument that allows one to see distantly