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Question

Which of the following are true with regard to metamorphic rocks?

1. They are formed inside the earth, under great pressure.

2. Some examples of metamorphic rocks are gneiss, slate, Breccia, rock salt, and quartzite.

3. The coastline of Brazil is made up of metamorphic rocks.

4. The layering within metamorphic rocks is called foliation

Codes:


A

1, 2, and 3

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B

3, and 4

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C

2, 3 and 4

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D

1 and 4

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Solution

The correct option is B

3, and 4


Metamorphic rocks are made by either heating up or squashing the earth's crust. They are often found in mountainous regions. Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form". Fossils Andreas can sometimes be found in it but they are often squashed. Other common metamorphic rocks are called gneiss, slate, marble, schist, and quartzite. The layering within metamorphic rocks is called foliation (derived from the Latin word folia, meaning "leaves"), and it occurs when a rock is being shortened along one axis during recrystallization.

They can be formed by pressures deep inside the Earth, by tectonic processes such as continental collisions, or when they are heated up by an intrusion of hot molten rock called magma from the Earth's interior.

The coastline of Brazil is made up of metamorphic rocks. These are shown here as stripy lines.


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