Polar regions of Earth

The polar regions, also called the frigid zones or polar zones, of Earth are special areas near the planet's geographical poles, including the North Pole and the South Pole. These high latitudes are mostly covered in ice and snow, making them some of the coldest places on Earth. In the north, floating sea ice covers much of the Arctic Ocean, while in the south, the thick Antarctic ice sheet sits on the continent of Antarctica, surrounded by the Southern Ocean.

These icy regions are important for many reasons. They help regulate the Earth's climate by reflecting sunlight back into space. The polar regions are also home to unique animals like polar bears, penguins, and seals, which have special adaptations to survive in such harsh conditions. Exploring these areas helps scientists understand how our planet works and how climate change is affecting the world.

Definitions

The Arctic can be defined in several ways: as the area north of the Arctic Circle, north of 60° north latitude, or from the North Pole south to the timberline. The Antarctic is generally considered the area south of 60° south latitude or simply the continent of Antarctica.

These polar regions are different from the rest of Earth, which includes a warm tropics belt near the equator and two cooler middle latitude regions in between.

Climate

Main article: Polar climate

Polar regions are very cold because they get less direct sunlight than other parts of Earth. The Sun's rays hit these areas at a slant, spreading the energy over a larger space and making it weaker. This is why polar regions stay cold most of the year.

The tilt of Earth's axis affects the climate here, but even in summer, the sunlight isn't strong enough to warm these areas much. Lots of ice and snow also reflect sunlight away, keeping things chilly. Polar regions have very cold temperatures, lots of ice, short cold summers, and big changes in daylight—from twenty-four hours of daylight in summer to complete darkness in winter.

Circumpolar Arctic region

See also: North Pole

The Earth's north polar region, called the Arctic, is home to many settlements. Countries with claims to Arctic areas include the United States (Alaska), Canada (Yukon, the Northwest Territories and Nunavut), Denmark (Greenland), Norway, Finland, Sweden, Iceland, and Russia. Though the populations in the Arctic are small, they often share more similarities with each other than with people from other parts of their own countries, making the Arctic a place of rich and diverse cultures.

Antarctica and the Southern sea

See also: Antarctica

The southern polar region does not have any permanent human residents. The largest research station there is McMurdo Station, operated by the United States. Other important stations include Palmer Station, Amundsen–Scott South Pole Station, Esperanza Base, Marambio Base, Scott Base, and Vostok Station.

Antarctica supports a rich ecosystem, especially near its coasts. The waters there bring up lots of nutrients, which help feed krill. These small sea creatures are an important food source for many animals, from penguins to blue whales.