On vacation at a lake, Saira’s mom sees an interesting-looking rock formation. Saira just learned about rocks in geology class and tells her mom that the formation is made of gneiss, a type of metamorphic rock. How did this metamorphic rock form?
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Metamorphic rocks started out as some other type of rock, but have been substantially changed from their original igneous, sedimentary, or earlier metamorphic form. ... Common metamorphic rocks include phyllite, schist, gneiss, quartzite and marble. ... There are several ways that non-foliated rocks can be produced.
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