science

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Across
  1. 1. Pangea
  2. 5. the exact age of something
  3. 7. the color shifts
  4. 8. the universe began to cool, protons and neutrons were formed
  5. 9. large division of time
  6. 11. large span of time
  7. 14. large amount of species died
  8. 17. glaciers that covered MN
Down
  1. 2. the close age of something
  2. 3. the amount of space a stare takes up
  3. 4. the time it takes half of the redio active atoms leave
  4. 6. one large continent
  5. 10. smaller division of time
  6. 12. small chages of temp and wealther
  7. 13. The universe formed in an instant
  8. 15. when a star dies
  9. 16. big sheets of ice covered the earth