The Mid-Ocean Ridges Are Elevated Above the Surrounding Sea Floor

Multiple Choice

The mid-ocean ridges are elevated above the surrounding sea floor because ________.

A) ridge rocks are hot and therefore have relatively low density
B) the lithosphere is thickest at the ridges so they stand up taller
C) rising ocean currents create a vacuum that pulls ridges up
D) ridge rocks are mafic,which are less dense than ultramafic ocean basin rock