Valley Development

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“By downward corrasion a stream cuts a steep-sided trench of its own width, but weathering, gravitation, and the wash of the rain widen it and make the sides sloping.” a, a young V-shaped valley; b and c, deeper; d, flood-plain condition. -Dryer, 1901




Charles R. Dryer Lessons in Physical Geography (New York, NY: American Book Company, 1901)


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