What metric unit would not be used to describe mass?

Answer (datum point);

None of them. they are likely to occur on any plate boundary

Ido believe it is b 

Ithink the answer is ,temperature,pressure, and chemical changethey are identified by texture,streak,and locationthere are three ways that metamorphic rocks can form contact, regional,and dynamic metamorphism good luck, all this came right outta of the book