All of the Following Are Differences Between MORBs and OIBs

Multiple Choice

All of the following are differences between MORBs and OIBs EXCEPT:

A) MORBs are composed of basalts, and OIBs are composed of gabbros.
B) MORBs probably formed from partial melting of the upper mantle, and OIBs probably formed from a deep part of the mantle.
C) MORBs contain less potassium and uranium than OIBs.
D) MORBs occur at divergent plate boundaries, and OIBs occur over hot spots.