The Colorado river runs through what deep valley?
The Grand Canyon. There is such little rain here that the valley sides are worn down only by the river, which makes them very steep
grand canyon there is such little rain here that valley sides are worn down only by river which makes them very steep
grand canyon there is such little rain here that valley sides are worn down only by river which makes them very steep
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The Grand Canyon. There is such little rain here that the valley sides are worn down only by the river, which makes them very steep