Blake

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Across
  1. 2. mass of a star
  2. 4. when a sheet of ice covered all of MN
  3. 5. when glaciers where made
  4. 6. when the universe began to cool
  5. 10. how the universe began
  6. 11. a time in an era
  7. 15. the estimated age of something
  8. 16. the halflife
  9. 17. lighter elements for together to make a bigger element
Down
  1. 1. when a bunch of things go extinct
  2. 3. the direct age of something
  3. 7. when the star runs out of fuel
  4. 8. a long period of time
  5. 9. how to tell if an item is moving
  6. 12. when the climate is changing
  7. 13. when all the continents where together
  8. 14. the guy who figured out that there was super continents