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Igloo is a unique house building made of blocks of ice. However, even though they are made of blocks of ice, they can stand very strong and don't melt when exposed to sunlight. An igloo is a building used by the Eskimos or a group of people who inhabit the North Pole as a temporary residence.
Basically Igloo houses are made of compacted snow. The snow that is used as the main material for this Igloo house must have structural strength, so that it does not easily fall or collapse when cut and overwritten with other snow. The best type of snow that can be used, is snow that has been blown by the wind, and can lock in ice crystals.