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

16. The Ocean Floor: The Abyssal Plains (C98)

The flattest parts of the ocean floor, which are also the flattest parts of Earth's surface, are the abyssal plains. They are at an average depth of 4500 m (about 16,000 ft). They are covered with a thick layer of ooze consisting of mud, sand, and decayed organic matter. The abyssal plains cover vast areas of the ocean floor.

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