science

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Across
  1. 3. Finding the exact age of fossils
  2. 6. The person who invented the theory of the super content
  3. 8. The time it takes the isotope to decay.
  4. 9. When the earth was covered in ice
  5. 10. A stars life
  6. 12. The formation of atoms in the universe.
  7. 18. What all the contents used to be like.
Down
  1. 1. When a star becomes a supernova
  2. 2. Finding a close age to fossils
  3. 4. The things that shaped the lakes in MN
  4. 5. When Stars and galaxies move farther and closer to us.
  5. 7. The theory on what started the Universe.
  6. 11. When atoms combine
  7. 13. The smaller version of an eon
  8. 14. A unit of time that equals a billion years
  9. 15. When large parts of the earth life were wiped out
  10. 16. The shorter version of an era
  11. 17. When the earth is heating up and it's bad for the earth