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which term is best described as a flat expanse of ocean floor?

Acontinental shelf
Babyssal plains
Cguyots
Ddeep sea trenches

Verified Answer :

The correct answer is (b) Abyssal plains

The flat expanse of ocean floor at the bottom of the sea is called abyssal plain which accounts for about 79% of the sea floor worldwide. It is the smoothest surface on the planet with less than 5 feet of vertical variation, that is most common in Atlantic.

Example: Largest Abyssal plain is Canary Abyssal

the correct answer is abyssal plains. Hope this works!