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Geology: Understanding Metamorphism

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Questions and Answers

What are the two main factors that cause metamorphism?

Water and pressure

Heat and water

Pressure and minerals

Heat and pressure (correct)

During which process do small crystals in the rock combine to form larger crystals?

Metamorphism

Metasomatism

Neometamorphism

Recrystallization (correct)

What is the process called where new minerals are formed by changing the chemical composition of the parent rock's crystals?

Metamorphism

Metasomatism

Neometamorphism (correct)

Recrystallization

Which type of rock is formed from the recrystallization of limestone?

Marble Signup and view all the answers

What does metasomatism involve?

Chemical change in rock's composition Signup and view all the answers

What is the meaning of 'metamorphic' in the context of geology?

A change in the form of rocks due to heat, pressure, or both Signup and view all the answers

What are the three main metamorphic processes mentioned in the text?

Recrystallization, neometamorphism, metasomatism Signup and view all the answers

What is impact metamorphism also known as?

Shock metamorphism Signup and view all the answers

What happens to the minerals under impact metamorphism?

They transform into a special form due to high temperature and pressure Signup and view all the answers

How do metamorphic rocks originate, according to the text?

From any type of rock: igneous, sedimentary, or other metamorphic rocks Signup and view all the answers

What is the organic matter formed in a swampy humid area called?

Peat Signup and view all the answers

At what depth and temperature does peat become low-grade lignite?

1 km deep and 50 degrees Celsius Signup and view all the answers

What happens to the peat at higher temperatures and in deeper zones within the earth's interior?

It becomes denser bituminous coal Signup and view all the answers

What is another name for anthracite?

Hard coal Signup and view all the answers

What causes the metamorphic rock process of metasomatism to start?

The alteration of chemical composition of crystals by gaseous chemicals Signup and view all the answers