(b) The Eskimo makes his house i.e. igloo from ice because it is very effective in keeping people warm. Human body loses heat in many ways like radiation, conduction, convection, evaporation and even by respiration. An igloo is a means by which there is less heat loss by wind convection and moisture by precipitation. By using just a lamp for heat inside the igloo can raise the temperature to 41 degree Fahrenheit when the air outside could be minus 40 degrees. With winds recorded up to several hundreds of miles per hour, convection becomes a major source of heat loss. The shape of the igloo constructed with a small tunnel to pass through actually helps keep the wind and excessive snow at bay. Thus an Igloo does not generate heat but preserves the heat generated by the human body.