science challange

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Across
  1. 4. educated guess
  2. 8. crust cooled rocks
  3. 9. the amount of time of isotope
  4. 10. cuts across sequence
Down
  1. 1. most recent era
  2. 2. old stuff
  3. 3. solar system forming rocks
  4. 5. exact age
  5. 6. sequence of rocks
  6. 7. a rock inside a rock