Igloos work by trapping heat inside the structure.
They are formed of compacted snow, which is a good insulator due to its many air pockets.
Heat is trapped in the air pockets, preventing it from escaping to the outside.
It is a traditional Arctic winter shelter for the Inuit people.
Igloos can also hold food and water. The igloo's cool temperature helps to keep food fresh and water from freezing.
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