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Derek Sivers’ post on the chronological dimension of geography is thought provoking. His examples relate more to the human elements of geography - cultural, political, social changes. But the idea applies to the geological as well; weathering from wind and rain will change a landscape. Even the seas are not exempt. The Baltic sea, under years of agricultural run-off, is now struggling under pollution induced oxygen depletion.

“Heraclitus says, you know, that all things move and nothing remains still, and he likens the universe to the current of a river, saying that you cannot step twice into the same stream.”
– Plato, Cratylus 402a