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A glacier challenges our daily knowledge about ice. Its ice is so deep and heavy that the pressure turns the ice into a slowly moving fluid that flows several inches per year. A glacier's seasonal freezing, thawing, and movement break up the rock along the sides. Underneath the gravel and silt, there's still more ice.
Image M0074560 [800x533 pixels]
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(Main content: 8/29/2009.  Page made: 4/21/2016.)