Most of the Ocean Floor Is Made Up of

Multiple Choice

Most of the ocean floor is made up of

A) deep-ocean trenches (8 to 11 km below sea level) .
B) abyssal plains (4 to 5 km below sea level) .
C) mid-ocean ridges (less than 2.5 km below sea level) .
D) Elevations of the sea floor are nearly uniformly distributed from sea level to 11 km depth.