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A Rift Valley
A deep narrow steep-sided valley formed by a river in the place where there is little rainfall .
are the tops of some mid-ocean ridges split by a steep-sided valley
A canyon.
Justin bieber
a mature river
Pass
ravine
ravine
yes, the mid ocean ridges are a steep sided valley at the center of a mid ocean ridge
A steep sided volcanoe formed entirely from ash and cinders is called a composite volcanoe.
A submarine canyon refers to a steep-sided valley cut into the sea floor of the continental slope. It is formed through turbidity currents that carve out the submarine canyons in the continental shelf.