1. The geologic periods in order from oldest to youngest are: Cambrian, Ordovician, Silurian, Devonian, Carboniferous permian, triassic, jurassic, cretaceous, tertiary, quaternary.
2. Camrin owed seven dollars, cause Peter's two jacks cost two quarters.
3. The rock layers in order are: D, A, E, B, C
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