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