Cloze: Complete the paragraph by filling in the missing terms.

21. Earth's Oceans: Summary (C99)

Four oceans and many seas make up one large body of salt water that covers move than 70 percent of Earth's surface. The salinity of oceans water comes mainly from minerals weathered from Earth's crust. Tremendous water pressure exists at the deepest parts of the ocean. Features of the ocean floor include a shallow shelf surrounding the continents, a steep slope, flat plains, volcanoes, trenches, and mountains.

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