A geography of antarctic

The angle of the Sun is low in the sky. Its waters have been sealed from air and light under the tremendous pressure of the continental ice sheet for perhaps as long as 35 million years. Great pieces of ice break away at the coast and drift away as icebergs.

The geography of Antarctica’s underside

The larger is generally known as East Antarctica because most of it lies in east longitudes. This dome-shaped ice sheet has been formed by the accumulation of snow over hundreds of thousands of years.

This relatively accessible region has the highest concentration of scientific stations, the most wildlife, and by far the highest level of tourist visits. A volcanic mystery Mount Sidley, the highest volcano in Antarctica, sits directly above a hot region in the mantle, Lloyd said.

Much of West Antarctica is a basin that lies below sea level bluealthough it is currently filled with ice, not water. Solid Earth on Nov. This means that a lot of the A geography of antarctic received from the Sun is reflected back into space.

A large mass of ice that floats on the sea. Significant earthquakes are not recorded along this or other known faults in Antarctica, the most seismically quiet of all continents, in which mostly minor activity is associated with surrounding oceanic ridges or volcanoes.

Stand at the South Pole and you will be on solid ground — well, solid ice over metres thick.

All About Sea Ice

The ice-choked and stormy seas around Antarctica long hindered exploration by wooden-hulled ships. The exceptions are the permanent settlements at just four main inland sites: Lloyd on his Skidoo towing a Conestoga the cook shack for the traverse team in front of Mount Sidley, a volcano that blew out its side much as Mount St.

Click here for more information. Mobility ceased approximately million years ago in the Transantarctic Mountains. The smaller, wholly in west longitudes, is generally called West Antarctica. The average altitude of Antarctica is metres the highest elevation of all continents and over twice the average elevation of Asia, the next highest.

Antarctica and continental drift The geologic evolution of Antarctica has followed a course similar to that of the other southern continents. Both evolved through long and slow geologic processes.

During the winter months it becomes so cold that the sea surrounding Antarctica freezes for hundreds of kilometres offshore. Imagine a snow flake landing at Dome A. This is the first time seismologists have been able to deploy instruments rugged enough to survive a winter in this part of the frozen continent, and so this is the first detailed look at the Earth beneath this region.

But it is not really typical of Antarctica. Antarctica had long been thought to be a migratory path for marsupials moving between southern continents in early Cenozoic time.

The breakup of Gondwana about million years ago started the episode of continental drift that separated Africa from South America, and formed the South Atlantic Ocean. All its mountain regions have been mapped and visited by geologists, geophysicists, glaciologists, and biologists. Right now, both of these factors are very poorly constrained.

Mount Erebus, which is 3, meters 12, feet in height, is located in East Antarctica, on the edge of the Ross Ice Shelf—a place where ice extends far out over the ocean.

Some of these icebergs are gigantic. Antarctica is home to many wildlife species such as the seal. According to some scientists, the discovery of Nothofagus pollen in the Transantarctic Mountains that dates to approximately 3 million years ago suggests that Nothofagus may have lingered as Antarctica drifted poleward, cooled, and became glaciated.

When water changes state from a liquid to a gas. No one knows what important segments of the record lie concealed in buried ranges such as the Gamburtsev Mountainsthe topography of which has been mapped only by seismic reflections through the great East Antarctic Ice Sheet.

It lies 4 kilometers 2 miles below the continental ice sheet. Ice-scarred volcanoesmany still active, dot western Ellsworth Land, Marie Byrd Land, and sections of the coasts of the Antarctic Peninsula and Victoria Landbut principal activity is concentrated in the volcanic Scotia Arc.

Relief in general would be great, with elevations ranging from 16, feet 4, metres at Vinson Massif in the Sentinel Range, the highest point in Antarctica, to more than 8, feet below sea level in an adjoining marine trough to the west Bentley Subglacial Trench. This ice breaks up to form pack-ice which, under the action of winds and currents, is constantly changing form and distribution.Over 98% of Antarctica is covered by ice.

It is the driest and coldest continent on earth. Antarctica is the fifth largest continent based on size, but it is the smallest in population with an official population of 0 (although some people do visit for scientific research).

The Antarctic Treaty () prevents militarization of the Antarctic continent and suspends territorial claims by states for the life of the treaty. Antarctica's Location and Geography Imagine flying in a plane over Antarctica, the southernmost continent and the coldest and driest region on earth.

From the air, you see that it covers a huge area, about 14 million square kilometers ( million square miles), about half the size of the United States.

The Geography of Antarctica

Antarctica's Location and Geography Imagine flying in a plane over Antarctica, the southernmost continent and the coldest and driest region on earth.

From the air, you see that it covers a huge area, about 14 million square kilometers ( million square miles), about half the size of the United States.

Geography of Antarctica. Usually when we talk about geography, it's important to consider two things: the physical and natural geography of an area, and the human geography of an area - the ways. Antarctica is Earth's southernmost continent, underlying the South Pole.

It is situated in the Antarctic region of the southern hemisphere, almost entirely south of the Antarctic Circle, and is surrounded by the Southern Ocean. Take this quiz to learn more interesting facts about the geography of.

A geography of antarctic
Rated 5/5 based on 61 review