See also:Grand Canyons of the
See also:Colorado and the Yellowstone
See also:rivers, and the
See also:gorge of the Niagara
See also:river below the falls, due to rapid stream erosion in a "
See also:young "
See also:land . A river saws its channel vertically down-wards, and a swift stream erodes chiefly at the bottom . In
See also:rainy regions the valleys thus formed are widened out by slope-
See also:wash and the resultant valley-slopes are gentle, but in arid regions there is very little side-extension of the valleys and the river cuts its way downwards, leaving almost vertical cliffs above the stream . If the stream be swift as in the western
See also:plateau of
See also:America, the cutting
See also:action will be rapid . The ideal conditions for developing a
See also:canyon are:
See also:great altitude and slope causing swift streams, arid conditions with
See also:absence of side-wash, and hard
See also:rock horizontally bedded which will hold the walls up . A B C D .
WILLIAM CANYNGE CANYNGES (c. 1399-1474)
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