Put the sentences in the correct older. (поставьте предложения в нужном порядке.)
1.the large landmasses in the oceans are the continents.
2.more than 70 percent of the earth's surface is covered by water, mainly the salf water of oceans and seas.
3. a plain is a flat or gently rolling area where there are few changes in elevation.
4. mountains have high relief-that is, they rise more than 2000 feet (610 m) above sea level.

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