Physical Science

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