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Exam 7: Metamorphism and Metamorphic Rocks

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Question 21

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Describe how contact metamorphism occurs.What are the important factors that cause rocks to alter in this type of metamorphism?

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Heat from a body of magma raises the tem...

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Question 22

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Some of the oldest known rocks,which have been dated at about 4.0 billion years,are metamorphic.What does this tell us about the age of Earth?

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Earth must be older than this ...

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Question 23

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The most important fluid promoting metamorphism is ____________________.

How can fluid activity promote metamorphism?

Why is time important to metamorphic processes?

The reaction of country rock with solutions from a cooling magma is known as:

What are some examples of nonfoliated metamorphic rocks?

Contact metamorphism along sills and dikes may produce metamorphosed zones many kilometers wide.

Which three processes bring about metamorphism?

The three types of metamorphism are ____________________,____________________,and ____________________.

What is the significance of foliation in a metamorphic rock? (Not what is foliation,but what does it mean in terms of the rock's history?)

Only magmatic fluids,not pore fluids of the country rock,have an effect on contact metamorphism.

If a rock is exposed to such high temperatures that it melts,it forms a(n)____________________ and becomes a(n)____________________ rock.

What is a metamorphic facies?

Metamorphism is most common along ____________________ plate boundaries.

One plate tectonic process that causes very widespread metamorphism is ____________________.

The index minerals that form in a metamorphic rock depend on the composition of the parent rock affected.

Metamorphic rocks can indicate the physical conditions that once existed in a geological setting.

Many ore deposits,including tin and tungsten,are associated with ____________________ metamorphism.

What causes dynamic metamorphism and where is it found?