All of the Following Are Processes That Form Metal- Rich

Multiple Choice

All of the following are processes that form metal- rich deposits at or near plate boundaries EXCEPT:

A) hot, hydrothermal solutions circulate through oceanic rocks.
B) plate collisions thrust metal- rich, sea- floor rocks above sea level.
C) metal- rich magmas develop above the subducting plate.
D) hot, metal- rich lavas are erupted along transform faults.