Which of the following is a characteristic of an igloo?

The characteristic of an igloo is that it is primarily constructed from blocks of ice and snow, rather than materials like wood, soil, or sod. The structure is designed to provide insulation in cold climates, utilizing the properties of ice to create a warm environment inside despite the cold outside temperatures.

The construction above ground is intentional; igloos are not built underground but often positioned on flat, snow-covered terrain. While some structures in colder climates might use sod for insulation, traditional igloos rely on snow and ice.

This understanding of igloos highlights their unique architectural qualities, which differ significantly from the materials and characteristics mentioned in the other options.