ACT Science Free Online Practice Test 1
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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.
Figure adapted from Sheldon Judson, Marvin Kauffman, and L. Don Leet, Physical Geology . ©1982 by Prentice-Hall, Inc.
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.
Figure 2 adapted from Frank Press and Raymond Siever, Earth . ©1986 by W. H. Freeman and Co.
PASSAGE-I
Figure adapted from Sheldon Judson, Marvin Kauffman, and L. Don Leet, Physical Geology . ©1982 by Prentice-Hall, Inc.
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.
| table 1 |
| A low B low C low to medium D low to medium E medium F medium to high G high |
| *Metamorphic grade is a measure of the intensity of metamorphism. |
Figure 2 adapted from Frank Press and Raymond Siever, Earth . ©1986 by W. H. Freeman and Co.
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