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Igneous Rocks and the Rock Cycle

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Questions and Answers

What process forms igneous rocks?

Metamorphism

Crystallization of magma (correct)

Weathering and erosion

Deposition and compaction

What is the meaning of the word 'igneous'?

Water

Ice

Air

Fire (correct)

In which part of Earth's crust do intrusive igneous rocks form?

Deep below ground (correct)

At the surface of a volcano

Above ground

Near the surface

Which type of igneous rock is formed when magma cools slowly inside Earth's surface?

Plutonic rock Signup and view all the answers

What determines the type of crystals formed in igneous rocks?

Composition of the magma Signup and view all the answers

What type of texture does obsidian, an extrusive igneous rock, have?

Glassy Signup and view all the answers

At what stage of the rock cycle are igneous rocks formed?

Crystallization Signup and view all the answers

What is the state of magma when it forms igneous rocks?

Liquid Signup and view all the answers

Which mineral is usually the most abundant oxide in igneous rocks?

Silicon dioxide Signup and view all the answers

What is the characteristic color of felsic rocks?

Light Signup and view all the answers

How do extrusive igneous rocks form?

By crystallization above ground Signup and view all the answers

Which type of igneous rock has a porphyritic texture?

Both intrusive and extrusive rocks Signup and view all the answers

What is the characteristic cooling process for aphanitic igneous rocks?

Fast cooling Signup and view all the answers

Which type of igneous rock is classified as mafic?

Gabbro Signup and view all the answers

What causes the bubbly texture in rocks like pumice?

Discharge of water and gasses from a volcano Signup and view all the answers