Question

Igloo are made up of blocks of ice. How they remain warm inside?

Answer 1

Because snow which is present outside the igloos works as very good insulator and snow is a bad conductor. so it traps air and makes the inside of the igloo warm

 That's why igloos are warm from inside. 

Answer 2

Because Snow insulates

Also, the dome shape offers little resistance to the wind. Inside an igloo, the temperature is usually around 32 degrees Celsius, rarely getting much colder with people inside.

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