Discussion
Slate, schist and gneiss represent increasing
Answer: C
Correct answer: grade of metamorphism
The three are the successive products of increasing temperature and pressure acting on a shale. Slate is low grade, with microscopic micas giving perfect cleavage; schist is medium grade, with visible micas and a wavy foliation; gneiss is high grade, with the minerals segregated into light and dark bands and the foliation coarse. The sequence is the standard illustration of metamorphic grade.
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