Antarctica

Antarctica

The ice-covered continent of Antarctica, which is the Earth’s most southerly region, has drawn explorers and entrepreneurs seeking challenge and riches in its wintry lands for over 200 years. The extreme climate has deterred any large-scale settlement of the continent, and though commercial hunters built outposts in the past, habitation is now limited to scientific bases. The Antarctic Treaty, which came into force in 1961, provides for international governance and scientific cooperation in place of potential territorial conflict.

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Resources

Many ore minerals, including iron and gold, are found in the Antarctic, and there are also coal reserves in the Transantarctic Mountains. The severe conditions and environmental importance of the region mean that exploitation of potential mineral resources is both uneconomic and undesirable. The unique wildlife and landscape draw a small number of tourists annually.

The landscape

There are two distinct parts to Antarctica: West Antarctica, a series of ice-covered, mountainous islands, joined together by the ice; and the high plateau of East Antarctica. The Ross Sea and the Weddell Sea are outliers of the Southern Ocean – deep bays partially covered by thick ice shelves.

Facts of Antarctica

  • Most settlements in Antarctica are research bases such as this one at Rothera on Adelaide Island, although there is a small Chilean settlement on King George Island.
  • On Elephant Island, the coast is edged by glaciers, although the land is not permanently covered by ice.
  • During the winter the seas surrounding Antarctica freeze, increasing the size of the continent by 100%.
  • Many volcanoes, some of them still active, can be found in the mountains of the Antarctic Peninsula.
  • Nearly half - 44% - of the Antarctic coastline is bounded by ice shelves, like the Ronne Ice Shelf, which float on the Ocean. These are joined to the inland ice sheet by dome-shaped ice “rises.”
  • High winds carrying snow form huge snowdrifts. The erosive power of the wind-borne snow can also sculpt the ice sheet to produce landforms known as sastrugi which align with the direction of the wind.
  • The Lambert Glacier is the largest glacier system in the world, up to 50 miles (80 km) wide at its seaward limit, and reaching 180 miles (300 km) into the interior by way of the Prince Charles Mountains.
  • Antarctica is the highest continent on Earth, because of the great thickness of ice which overlays the land. In places the ice alone can each up to 15,700 ft (4800 m) thick. Much of the basement rock of west Antarctica lies below sea level, pushed down by the weight of the ice.
  • More than 30% of Antarctic ice is contained in the Ross Ice Shelf.
  • The sun sets over the Antarctic Peninsula for more than six months during the winter. However, there are more hours of sunshine during the brief Antarctic summer than most equatorial countries experience in a whole year.
  • Large colonies of seabirds live in the extremely harsh Antarctic climate. The Emperor penguins seen here, the smaller Adélie penguin, the Antarctic petrel, and the South Polar skua are the only birds that breed exclusively on the continent.