North America

North America is a continent entirely within the Northern Hemisphere and almost all within the Western Hemisphere. It can also be described as the northern subcontinent of the Americas. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Caribbean Sea, and to the west and south by the Pacific Ocean. Because it is on the North American Tectonic Plate, Greenland is included as part of North America geographically.

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South America

South America can be divided into three physical regions: mountains and highlands, river basins, and coastal plains. Mountains and coastal plains generally run in a north-south direction, while highlands and river basins generally run in an east-west direction. South America’s extreme geographic variation contributes to the continent’s large number of biomes. A biome is a community of animals and plants that spreads over an area with a relatively uniform climate.

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Europe

Europe, second smallest of the world’s continents, composed of the westward-projecting peninsulas of Eurasia and occupying nearly one-fifteenth of the world’s total land area. It is bordered on the north by the Arctic Ocean, on the west by the Atlantic Ocean, and on the south by the Mediterranean Sea, the Black Sea, the Kuma-Manych Depression, and the Caspian Sea. The continent’s eastern boundary (north to south) runs along the Ural Mountains and then roughly southwest along the Emba (Zhem) River, terminating at the northern Caspian coast.

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Africa

Africa, the second largest continent (after Asia), covering about one-fifth of the total land surface of Earth. The continent is bounded on the west by the Atlantic Ocean, on the north by the Mediterranean Sea, on the east by the Red Sea and the Indian Ocean, and on the south by the mingling waters of the Atlantic and Indian oceans.The Sahara, the world’s largest contiguous desert, occupies more than one-fourth of the total land area. Less than one-tenth of Africa’s land area is arable, while nearly one-fourth is forested or wooded. The continent’s hydrology is dominated by the Nile River in the north, the Niger River in the west, and the Congo River in central Africa. The peoples of Africa probably speak more languages than those of any other continent. Arabic is predominant from Egypt to Mauritania and in Sudan.

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Asia

Asia is the largest of the world’s continents, covering approximately 30 percent of the Earth’s land area. It is also the world’s most populous continent, with roughly 60 percent of the total population. Asia makes up the eastern portion of the Eurasian supercontinent; Europe occupies the western portion. The border between the two continents is debated. However, most geographers define Asia’s western border as an indirect line that follows the Ural Mountains, the Caucasus Mountains, and the Caspian and Black Seas. Asia is bordered by the Arctic, Pacific, and Indian Oceans. Asia can be divided into five major physical regions: mountain systems; plateaus; plains, steppes, and deserts; freshwater environments; and saltwater environments. The Himalaya mountains extend for about 2,500 kilometers (1,550 miles), separating the Indian subcontinent from the rest of Asia.

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Australia

Australia is the only country in the world that covers an entire continent. It is one of the largest countries on Earth. Although it is rich in natural resources and has a lot of fertile land, more than one-third of Australia is desert. Most Australian cities and farms are located in the southwest and southeast, where the climate is more comfortable. There are dense rain forests in the northeast. The famous outback (remote rural areas) contains the country's largest deserts, where there are scorching temperatures, little water, and almost no vegetation. Canberra is Australia's capital city. With a population of approximately 380,000 people and situated in the Australian Capital Territory, Canberra is roughly half way between the two largest cities Melbourne and Sydney. Australia has 19 listed World Heritage properties. Australia is also famous for its landmark buildings including the Sydney Harbour Bridge; its ancient geology, as well as for its high country.

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Antarctica

Often described as a continent of superlatives, Antarctica is not only the world’s southernmost continent. It is also the world’s highest, driest, windiest, coldest, and iciest continent. Antarctica is about 5.5 million square miles (14.2 million square km) in size, and thick ice covers about 98 percent of the land. The continent is divided into East Antarctica (which is largely composed of a high ice-covered plateau) and West Antarctica (which is largely an ice sheet covering an archipelago of mountainous islands).

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