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Some large geologic structures can actually form relatively quickly. e.g. The Great Lakes were created from meltwater of retreating glaciers 10-12 kya (although the underlying rift basin could be more like a billion years old).
Some large geologic structures can actually form relatively quickly. e.g. The Great Lakes were created from meltwater of retreating glaciers 10-12 kya (although the underlying rift basin could be more like a billion years old).
But the Grand Canyon is not among those.