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Two plates when pushed upwards and against each other form mountain ranges. The reverse process is when two plates pull away from each other which would result in a canyon. A normal sized river flows due to this, running from north to south on its top.

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Plate Tectonics raises uplands and mountain chains, yes, but canyons in such landscapes are incised by rivers. Plate rifting (rather than plates pulling away from each other, which is a constructive plate margin) can create a rift valley such as the Great Rift Valley in Kenya. While such a valley may carry a river it does so by consequence. The last sentence does not really make sense.

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