Discussion
................... terrains are represented as deep crustal rocks that have been technically exhumed of hot and dry magmatism.
Answer: B
The key's answer is granulite terrains.
Granulite-facies rocks form at high temperature, typically 700-900 °C or more, and moderate to high pressure in the deep crust, under 'dry' conditions with low water activity in which hydrous minerals give way to pyroxenes. Granulite terrains such as those of southern India are therefore exposures of deep crustal rocks that have been tectonically exhumed, and their hot, dry conditions are often linked with underplating magmatism.
Greenstone belts are low-grade volcanic-sedimentary sequences of upper crustal origin. Gneiss and metasedimentary rocks describe texture and parent rock and do not specifically denote deep, hot and dry crust.
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