The coldest, windiest and driest continent, Antarctica contains 90 percent of all of the ice on Earth in an area just under one and a half times the size of the United States. But the southernmost continent is more than one big block of ice.
Lying in the Antarctic Circle that rings the southern part of the globe, Antarctica is the fifth largest continent. Its size varies through the seasons, as expanding sea ice along the coast nearly doubles its size in the winter. Most of Antarctica is covered with ice; less than half a percent of the vast wilderness is ice free.
The continent is divided into two regions, known as East and West Antarctica. East Antarctica makes up two-thirds of the continent, and is about the size of Australia. Ice in this part of the continent averages 1.2 miles (2 kilometers) thick. West Antarctica, on the other hand, is a series of frozen islands stretching toward the southern tip of South America, an extension of the Andes Mountains prominent on the warmer continent. The two regions are separated by the Transantarctic Mountains, a range that stretches across the entire continent, although sometimes covered by ice.
The ice of Antarctica is not a smooth sheet but a continuously changing expanse. Glaciers inch across the continent, cracking and breaking the ice. Crevasse fields with cracks hundreds of feet deep span the continent, hidden by only a shallow layer of snow. Icebergs fall along the coast, where shelves and glaciers break off into the sea. [PHOTOS: Antarctica, Iceberg Maker]
Despite its thick ice, Antarctica is classified as a desert because so little moisture falls from the sky. The inner regions of the continent receive an average of 2 inches (50 millimeters) of precipitation — primarily in the form of snow — each year. More rain falls in the Sahara desert. The coastal regions receive more falling moisture, but still only average 8 inches (200 mm) annually. Unlike most desert regions, however, the moisture doesn't soak into the ground. Instead, the snow piles on top of itself.
Although little liquid falls from the sky, Antarctica still boasts colossal blizzards. Like sandstorms in the desert, the wind picks snow up from the ground and blows vast white blankets. Winds can reach up to 200 mph (320 km/h).
Because it lies in the Southern Hemisphere, seasons in Antarctica are the opposite of seasons in the north. Summer runs from October to February and winter covers the remainder of the year. But don't pack your swimsuit and sunglasses — Antarctic summers average just above freezing, with the more mountainous East Antarctica colder than its western counterpart. The lowest temperature in the world, minus 89.6 degrees Celsius (minus 129.3 degrees Fahrenheit), was recorded at the Russian Vostok station in Antarctica.
Antarctica has no trees or bushes. Vegetation on the continent is composed of mosses, lichen and algae. Penguins, whales and seals live in and around Antarctica, as do fish and krill. The male Emperor penguin is the only warm-blooded animal to remain on the continent through the freezing winter while nesting on the single egg laid by its mate. (The female spends nine weeks at sea and returns in time for the egg to hatch.)
There are no indigenous populations of people on the frozen continent. Today, human habitation exists at a variety of science research stations placed by a number of countries. The freezing weather is an excellent location to study how the body and mind adapts to the cold. Scientists also drill for ice cores, which can provide a climate history of the region over thousands of years. The vast vegetation-free expanse makes an excellent place to search for meteorites; the dark rocks stand out easily on the white backdrop and don't find themselves covered by growing plants. Other projects include the study of penguins, fish, global warming, glaciology, astronomy and climatology.
The frozen southern region was the last continent discovered. It wasn't spotted until 1820. American sealer John Davis was the first to state he landed on Antarctica in 1821, although some historians dispute his claim.
At the beginning of the 20th century, two groups of explorers set out across the desolate Antarctic landscape in a race to walk where no man had walked before. The first team to reach the South Pole was led by Norwegian explorer Roald Amundsen. Amundsen spent 99 days racing Robert Scott, an English naval officer, to the South Pole.
Amundsen, a veteran polar traveler, led a team of 18 men across the frozen continent, finally reaching the pole on Dec. 14, 1912. Scott and his crew made it to the pole four weeks later on Jan. 17, 1913, but did not make it back alive. A search party found Scott and his two remaining companions inside their sleeping bags in a small tent out on the ice, just 11 miles (17 kilometers) from the nearest cache of food and supplies. The searchers covered the tent with snow and left the dead men where they lay.
In 1914, Irish explorer Ernest Shackleton set out to be the first explorer to achieve an overland crossing of Antarctica through the South Pole — about an 1,800 mile trek. He put together a crew of 28 men, which included two surgeons, a meteorologist, an explorer, a carpenter, a soldier and a photographer. He also brought along 69 sled dogs, each weighing around 100 lbs., according to The Guardian.
The ship, which Shackleton had named Endurance, had been newly constructed in Norway and originally intended for tourist cruises in the Arctic, according to Cool Antarctica. The crew set out from London on August 1, 1914, the day that Germany declared war on Russia, according to PBS.org. Before setting off, however, Shackleton offered his ship and resources to the British war effort but was told to go ahead and proceed on his exploration. The crew then set sail for Buenos Aires, Argentina, and then to the island of South Georgia.
On Dec. 5, 1914, the crew left South Georgia and headed into the Weddell Sea. After pushing through a thousand miles of pack ice for six weeks, the ice closed in around the ship on Jan. 18, 1915. Unable to push through the ice without drastically depleting their fuel supply, Shackleton decided to stand still and wait. At that point, the ship was only about 100 miles — about one day's sail — from their destination of Vahsel Bay, according to Cool Antarctica. Shackleton considered crossing the ice to begin their trek, but summer was already half over and time was against him. The crew remained hopeful, however, that a change in the wind would loosen the grip of the pack ice. Unfortunately, Endurance drifted for months, stuck in ice in the Weddell Sea.
Forever an optimist, however, Shackleton kept the crew's spirits high. They played sports on the sea ice, had dinners together on the ship and even put on plays. Unfortunately, on Nov. 21, 1915, the ship finally succumbed to the incredible pressure of the ice and began to sink. The crew was forced off the boat with a shout from Shackleton: "She's going, boys!"
Shackleton wrote in his diary: "At 5 pm she went down by the head: the stern the cause of all the trouble was the last to go under water. I cannot write about it," according to eShackleton.com.
Shackleton and his crew were forced to camp on the sea ice for several weeks. When the ice pack began to break, the crew piled into three lifeboats and headed for Elephant Island. When survival seemed unlikely if they stayed any longer on the island, six of the men, Shackleton included, made a final, desperate attempt to cross the sea to South Georgia Island in a lifeboat. The remaining 22 crew members waited on Elephant Island. Shackleton wasn't able to get back to rescue the rest of the crew until Aug. 30, 1916 — 22 months after they'd originally set out from South Georgia, according to PBS.
Although the Antarctic crossing never occurred, Shackleton is still highly regarded for his ability to preserve the sanity and lives of every single crew member. Shackleton's final desperate journey to South Georgia, known as the Voyage of the Jaimes Caird (the name of the lifeboat), is regarded as one of the greatest small-boat journeys ever recorded, as the men managed to travel 830 nautical miles (1,500 km) across the stormiest sea on earth in a 22-foot lifeboat, according to Shackleton Legacy.
Other facts about Antarctica
Catherine Mikkelson, the wife of a Norwegian whaling captain, became the first woman to visit Antarctica in 1935.
As part of its effort to claim a portion of Antarctica, Argentina sent a pregnant woman to the continent. In January 1979, Emile Marco Palma became the first child born in on the southernmost continent.
The area of Antarctica is approximately 5.4 million square miles (14 million square kilometers). The United States is 3.6 million square miles (9.36 million square kilometers).
There are no huskies pulling sleds in Antarctica. As of 1994, no non-native species may be taken to Antarctica. Motor-powered vehicles are the primary method of transportation across the ice.
At least two active volcanoes exist in Antarctica. The highest, Mount Erebus (12,448 feet; 3,794 meters) boasts a permanent lake. The other lies on Deception Island, off the Antarctic Peninsula. Although eruptions in 1967 and 1969 damaged science stations there, the island remains a popular stop-off for tourists, who can bathe in the water warmed by the volcano while surrounded by ice.
If you throw boiling water into the air in Antarctica, it will instantly vaporize. Most of the particles will turn into steam while others are instantly converted to small pieces of ice.
Millions of years ago, Antarctica had a much warmer climate and boasted evergreen forests and a variety of animals. Fossils of this earlier period provide scientists with clues about life before Antarctica became a vast icy shelf.
Melting Antarctica's ice sheets would raise oceans around the world by 200 to 210 feet (60 to 65 m).
In 2000, the largest recorded icebergs broke free from the Ross Ice Shelf, a region the size of Texas. With a surface area of 4,250 square miles (11,000 square km) above water and 10 times the size beneath, the iceberg was approximately as large as Connecticut.
Additional reporting by Traci Pedersen, Live Science contributor.