What is a semi-fluid layer of solid-liquid rock?

None   they are   equally likely to occur on any plate boundary

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

Iwould say this is falsedefinition: toward or near the equatorhope that : )