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Understanding Metamorphic Rocks

Earth Science9 CardsCreated 4 months ago

This deck covers key concepts about the formation, characteristics, and exposure of metamorphic rocks, including processes like foliation and subduction.

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How are metamorphic rocks formed?

Preexisting rock is altered through heat and pressure.
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Key Terms

Term
Definition
How are metamorphic rocks formed?
Preexisting rock is altered through heat and pressure.
Do metamorphic rocks look like the preexisting rock from which they form?
sometimes, but not always
What is foliation?
banding in metamorphic rocks that results from the reorientation of minerals
How will foliation in continental metamorphic rocks formed during subduction be oriented?
perpendicular to the direction of plate movement
What would you call a granite that has undergone metamorphism and now exhibits foliation?
gneiss
Where do most metamorphic rocks form?
between a few and many kilometers beneath Earth's surface
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Understanding Metamorphic Rocks
TermDefinition
How are metamorphic rocks formed?
Preexisting rock is altered through heat and pressure.
Do metamorphic rocks look like the preexisting rock from which they form?
sometimes, but not always
What is foliation?
banding in metamorphic rocks that results from the reorientation of minerals
How will foliation in continental metamorphic rocks formed during subduction be oriented?
perpendicular to the direction of plate movement
What would you call a granite that has undergone metamorphism and now exhibits foliation?
gneiss
Where do most metamorphic rocks form?
between a few and many kilometers beneath Earth's surface
How do metamorphic rocks reach Earth's surface?
through removal of overlying rocks
Which two rock types would you expect to see sitting next to each other after a very long period characterized by only uplift and erosion?
metamorphic and sedimentary rocks
Could metamorphic rocks reach the surface of a planet without rock-uplifting processes?
D. No, metamorphic rocks must be uplifted and exposed by erosion.