Exploring Igneous Rocks Flashcard

Front

What type of igneous rock is formed from lava that cools quickly on the Earth's surface?

Back

Extrusive

Front

What igneous rock texture indicates that the rock cooled very rapidly?

Back

Glassy

Front

What texture is characterized by large crystals embedded in a finer-grained groundmass?

Back

Porphyritic

Front

What is the main difference between felsic and mafic igneous rocks?

Back

Felsic rocks have higher silica content than mafic rocks.

Front

Which of the following is an example of an intrusive igneous rock?

Back

Granite

Front

What is the process called when molten rock cools and solidifies to form igneous rocks?

Back

Crystallization

Front

What are the two main types of igneous rocks?

Back

Intrusive and extrusive.

Front

What is the primary mineral composition of felsic igneous rocks?

Back

High in quartz and feldspar.

Front

What is the primary mineral composition of mafic igneous rocks?

Back

High in magnesium and iron.

Front

How does the cooling rate of magma affect the crystal size in igneous rocks?

Back

Slower cooling allows for larger crystals to form.