QuestionMay 29, 2025

Of the following four rocks, which forms at the highest temperature during metamorphism? phyllite slate schist gneiss

Of the following four rocks, which forms at the highest temperature during metamorphism? phyllite slate schist gneiss
Of the following four rocks, which forms at the highest temperature during metamorphism?
phyllite
slate
schist
gneiss

Solution
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Answer

Gneiss forms at the highest temperature during metamorphism. Explanation 1. Identify the metamorphic grade Metamorphic rocks are classified by their grade, which indicates the temperature and pressure conditions during formation. Higher-grade rocks form at higher temperatures. 2. Compare rock grades Phyllite and slate are low-grade metamorphic rocks. Schist is medium-grade, while gneiss is high-grade.

Explanation

1. Identify the metamorphic grade<br /> Metamorphic rocks are classified by their grade, which indicates the temperature and pressure conditions during formation. Higher-grade rocks form at higher temperatures.<br /><br />2. Compare rock grades<br /> Phyllite and slate are low-grade metamorphic rocks. Schist is medium-grade, while gneiss is high-grade.
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