Geologic Time Scale

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Across
  1. 2. Rocks that are old sometimes animals
  2. 4. Law meaning older rocks the on bottom
  3. 5. The Time it takes a chemical to get to 1/2 of its life
  4. 6. The age of a rock around another
  5. 7. Age of Present day
  6. 9. Age of Dinosouars
  7. 10. Chaotic events in earth history
Down
  1. 1. given in numerical date to tell how old
  2. 3. First glaciers formed
  3. 8. When earth started to cool