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Yosemite Valley's sheer walls and flat floor evolved as alpine
glaciers moved through the canyon of the Merced River. The ice
carved through weaker sections of granite, plucking and scouring
rock but leaving intact harder portions, such as El Capitan and
Cathedral Rocks. Glaciers greatly enlarged the canyon that the
Merced River had carved through successive uplifts of the Sierra
Nevada. [Continue]
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