<P> Polar regions receive less intense solar radiation than the other parts of Earth because the sun's energy arrives at an oblique angle, spreading over a larger area, and also travels a longer distance through the Earth's atmosphere in which it may be absorbed, scattered or reflected, which is the same thing that causes winters to be colder than the rest of the year in temperate areas . </P> <P> The axial tilt of the Earth has a major effect on climate of the polar regions . Since the polar regions are the farthest from the equator, they receive the least amount of sunlight and are therefore frigid . The large amount of ice and snow also reflects a large part of what little sunlight the Polar regions receive, contributing to the cold . Polar regions are characterized by the polar climate, extremely cold temperatures, heavy glaciation wherever there is sufficient precipitation to form permanent ice, and extreme variations in daylight hours, with twenty - four hours of daylight in summer, and complete darkness at mid-winter . </P> <P> There are many settlements in Earth's north polar region . Countries with claims to Arctic regions are: the United States (Alaska), Canada (Yukon, the Northwest Territories and Nunavut), Denmark (Greenland), Norway, Finland, Sweden, Iceland, and Russia . Arctic circumpolar populations often share more in common with each other than with other populations within their national boundaries . As such, the northern polar region is diverse in human settlements and cultures . </P> <P> The southern polar region has no permanent human habitation . McMurdo Station is the largest research station in Antarctica, run by the United States . Other notable stations include Palmer Station and Amundsen--Scott South Pole Station (United States), Esperanza Base and Marambio Base (Argentina), Scott Base (New Zealand), and Vostok Station (Russia). </P>

Account for the lack of heavy precipitation in the polar regions