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Typically quoted along with "the past is the key to the present" (or visa versa), this concept is the idea that geologic processes occuring now have always occurred throughout earths history (although NOT always at the same rate or intensity).

Some examples: we see volcanoes erupting now, so there must have been volcanoes erupting in the past. We see animals go extinct now, so therefore animals must have gone extinct in the past. We see erosion causing sand along a beach now, so therefore sand in the geologic record must have formed at beaches. We see climate change now, so climate must have changed in the past. And so on.

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13y ago

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