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COVER: Pleistocene glaciers sculpted the granite of Yosemite National Park (California, USA), leaving behind huge swaths of glacial polish like the one shown here in the upper Merced River watershed. See “Composition and formation age of amorphous silica coating glacially polished surfaces” by Blackburn et al., p. 347–350.
Photo by: Greg M. Stock
Cover design by: Eric Christensen
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