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

a. continental shelf
b. abyssal plains
c. guyots
d. deep sea trenches

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!

hello there the answer is d