Igneous Rock

Front

What is the definition of igneous rock?

Back

Igneous rock is formed from the solidification of molten material called magma or lava.

Front

What are the two main types of igneous rock?

Back

The two main types of igneous rock are intrusive (plutonic) and extrusive (volcanic).

Front

What is granite?

Back

Granite is a coarse-grained igneous rock that is primarily composed of quartz, feldspar, and mica.

Front

What is basalt?

Back

Basalt is a fine-grained igneous rock that is rich in iron and magnesium, typically formed from lava that cools quickly.

Front

What does the term 'magma' refer to?

Back

Magma is molten rock located beneath the Earth's surface.

Front

What is the difference between magma and lava?

Back

Magma is found underground, while lava is magma that has reached the Earth's surface.

Front

What is the texture of igneous rocks?

Back

The texture of igneous rocks can vary from coarse-grained to fine-grained, depending on the cooling rate of the magma.

Front

What is a porphyritic texture?

Back

Porphyritic texture is characterized by large crystals embedded in a finer-grained matrix, indicating a complex cooling history.

Front

What is the significance of silica content in igneous rocks?

Back

Silica content affects the color and viscosity of magma; high silica results in lighter-colored rocks, while low silica results in darker rocks.

Front

What type of igneous rock is formed from rapid cooling of lava?

Back

Extrusive igneous rock is formed from the rapid cooling of lava.