How does an igloo manage to keep its occupants warm even when the outside temperature drops far below freezing?
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Igloos are built from compacted snow, which is packed with tiny, trapped air pockets. These air pockets act as an excellent thermal insulator, trapping body heat and raising the inside temperature up to 40 degrees warmer than the outside air. Photo: Drawn by unknown artist based on sketches by C.F. Hall and photographed from the, Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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