Geologic time scale

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Across
  1. 2. near exact age of a rock.
  2. 3. a long period in time.
  3. 7. estimate of a rocks age.
  4. 8. a lump of minerals.
  5. 9. any material trapped inside a mineral as it forms.
  6. 10. Remains of plants/animals preserved in sediments.
Down
  1. 1. when the highest layer is youngest and bottom layer is oldest.
  2. 4. science that deals with earth's physical structure and substance.
  3. 5. any feature that cuts through the ground is younger than everything it cut through.
  4. 6. rate of decay