USA HISTORY

Detailed explanation-1: -Inuit bands in Canada and Greenland, for example, engineered “snow houses”-more commonly known as igloos. Igloos were circular structures made of stacked ice (often sea ice), insulated with snow.

Detailed explanation-2: -Earth’s Changing Ice Sheets Ice sheets are massive expanses of ice that stay frozen from year to year and cover more than 6 million square miles. On Earth, ice sheets extend across most of Greenland and Antarctica. These two ice sheets contain more than 99% of the planet’s freshwater ice.

Detailed explanation-3: -The polar regions are covered with snow throughout the year.

Detailed explanation-4: -An igloo is a shelter built from snow and ice. Not all the people of the Arctic built igloos. The Inuit people of Northern Canada built them. Igloos were never permanent houses for the Inuit.

Detailed explanation-5: -The Arctic is an ocean, covered by a thin layer of perennial sea ice and surrounded by land. ("Perennial” refers to the oldest and thickest sea ice.) Antarctica, on the other hand, is a continent, covered by a very thick ice cap and surrounded by a rim of sea ice and the Southern Ocean.