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Our transcription: Modern concepts of landscape evolution began with an American geomorphologist, William Morris Davis. He believed that rivers and streams gradually wear down rugged mountain slopes to form plains. He classified landscapes by their maturity and used the terms "youthful," "mature," and "old age" to categorize their stages of development. Davis' work done mostly in the Appalachian Mountains, conceived of landscapes as going through a distinct series of stages that began with an uplift of the area, supplying streams with potential energy which they could then use to carve their valleys.
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