This is what an Igloo looks like when you build a fire inside. The fire inside melts the inner layer of ice, and the cold outside refreezes it, adding a layer of insulation that can keep the igloo at 60° inside while it's -50° outside.
This is what an Igloo looks like when you build a fire inside. The fire inside melts the inner layer of ice, and the cold outside refreezes it, adding a layer of insulation that can keep the igloo at 60° inside while it's -50° outside.
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