Passage I
Metamorphic rocks form when temperature and/or pressure cause changes in preexisting rock. Figure 1 shows the temperature and pressure conditions in which certain facies (categories of metamorphic rocks) are formed.
A rock’s metamorphic grade (a measure of the intensity of metamorphism) is classified on a scale of low (very similar to the original rock) to high (very different from the original rock). Table 1 lists the grades of Facies A–G from Figure 1. Figure 2 shows characteristic minerals that may be present in rocks of a given grade.
1. According to Figure 2, which of the following minerals would most typically be found only in rocks of a medium grade?
Your Answer is
Correct Answer is C
Explanation
Look at figure 2, kyanite only appears in medium grade