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Continent - MSN Encarta |
 | | The continents, in order of size, are Eurasia (conventionally regarded as the two continents of Europe, individually the second smallest, and Asia), Africa, North America, South America, Antarctica, and Australia. |
 | | In geology, continents are defined in terms of the earth's crustal structure and constituency, rather than land-surface areas. |
 | | The study of the history and origins of continental drift is called plate tectonics because, in charting the directions that the continents have taken, geologists discovered that the earth's crust and upper mantle are divided into a number of semirigid plates, each of which has recognizable boundaries and moves as a unit. |
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