Serac
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Seracs (originally from Swiss French sérac, a type of crumbly white cheese) are blocks or columns of ice formed by intersecting crevasses on a glacier. Often house-sized or larger, they are dangerous to mountaineers since they may topple with little warning. Even when stabilized by persistent cold weather, they can be a impediment to glacier travel. Seracs are found within an icefall, often in large numbers, or at the ice cliff on the lower edge of a hanging glacier.<ref name="Post & Lachapelle">Post, Austin and Edward R. Lachapelle (Revised edition (May 2000)). Glacier Ice. University of Washington Press.</ref>
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