Chapter 3: Metamorphic Rocks

How are metamorphic rocks formed?

Preexisting rock is altered through heat and pressure.

What is foliation?

banding in metamorphic rocks that results from the reorientation of minerals

Where do most metamorphic rocks form?

between a few and many kilometers beneath Earth's surface

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

Could metamorphic rocks reach the surface of a planet without rock-uplifting processes?

A. No, to be exposed, metamorphic rocks must be uplifted and deposited. B. Yes, for metamorphic rock to be exposed, it must be eroded from above. C. Yes, for metamorphic rock to be exposed, rock must be deposited on it. **D. No, metamorphic rocks must be uplifted and exposed by erosion.

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

Do metamorphic rocks look like the preexisting rock from which they form?

sometimes, but not always

How do metamorphic rocks reach Earth's surface?

through removal of overlying rocks