The Universe

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Across
  1. 3. the theory of the start of the universe 13.8 byg
  2. 4. part of time
  3. 7. glaciers in MN
  4. 10. period of time with note worthy events
  5. 11. a form of large land
  6. 13. the life of a star
  7. 15. when the earth is getting hotter by carbon
  8. 17. the cosmic formation of atoms
  9. 18. combines two lighter elements into a heavy
  10. 19. when a era ends caused by a big killing
Down
  1. 1. first statement of the continental drift theory
  2. 2. the time taken for the radioactivity of a specified isotope to fall to half its original value
  3. 5. a time with huge glaciers
  4. 6. when stars start to burning helium to carbon
  5. 8. when stars are moving away
  6. 9. last to billions of years
  7. 12. to determine how old rocks are (not actual age)
  8. 14. when stars are moving towards you
  9. 16. using radioactive isotopes to determine