Across
- 5. Humans have been affecting this around earth
- 9. theory is about the continents drifting
- 11. the start of the universe
- 12. A very cold time in earths history
- 14. the fusion of atoms from already existing ones
- 17. what wiped out the dinasours and the other sources of life
- 18. what caused the lakes to form in MN
Down
- 1. two atoms combine to make one nuclei
- 2. gives an acurate age on rocks
- 3. The biggest time starter
- 4. describes if light is moving away or to us
- 6. its split into three sections in earths history
- 7. Pangea
- 8. used to age rocks
- 10. Can either make a black hole or can make dust
- 13. decides the fate of a star
- 15. there are 12 of these in earths history
- 16. the amount of time it takes to break down