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More canyon walls:<br> Sumatra picture - Canyons were either carved by flowing water/river thru geologic time (millions of years) or were submerged under water several million years ago but eventually arise out of the sea via the forces of plate tectonics a.k.a. "uplifiting."
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Canyons were either carved by flowing water/river thru geologic time (millions of years) or were submerged under water several million years ago but eventually arise out of the sea via the forces of plate tectonics a.k.a. "uplifiting."
Asia
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image -- 1026 x 823)