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A glacier forms in a place where snow builds up year after year for a long time. The key thing is that the snow does not melt away in the summer. As the snow builds up over time, its own weight causes it to compress into ice. When the ice gets thick enough, it begins to flow under the influence of gravity. Glaciers can form only on relatively flat areas, or on slopes with less than 30 degrees of pitch in the mountains; too much steeper and the snow will avalanche instead of building up to a thickness that would form into ice.
by crystal
by crystal

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9y ago

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