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Icebergs were once part of a glacier. To better understand an iceburg, one must know what a glacier is made from. When the temperature is low enough that the sun doesn't melt snow, the snow then accumulates on top of itself, compressing and eventually hardening to become a glacier. The edges of the huge glaciers have ice shelves where the glacier itself meets the ocean and parts of the glacier float. These can break off to form icebergs when the waves from the ocean erosion on the thinner stretches of the ice shelf.

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