Igneous Rocks

Front

What are igneous rocks?

Back

Igneous rocks are formed from the cooling and solidification of magma or lava.

Front

What is the difference between intrusive and extrusive igneous rocks?

Back

Intrusive igneous rocks form from magma that cools slowly beneath the Earth's surface, while extrusive igneous rocks form from lava that cools quickly on the surface.

Front

How do coarse-grained intrusive igneous rocks form?

Back

Coarse-grained intrusive igneous rocks form from slow cooling magma.

Front

What is an example of an extrusive igneous rock?

Back

Rhyolite is an example of an extrusive igneous rock.

Front

What does high silica content in magma indicate about the color of the rock?

Back

High silica content in magma usually results in lighter-colored rocks.

Front

What type of igneous rock is formed from low silica and high iron content?

Back

Low silica and high iron content in magma usually forms dark colored rocks, such as basalt.

Front

What texture is created by extremely rapid cooling of lava?

Back

Extremely rapid cooling of lava creates a glassy texture.

Front

What is the texture of fine-grained igneous rocks?

Back

Fine-grained igneous rocks have small crystals due to rapid cooling.

Front

What is the texture of coarse-grained igneous rocks?

Back

Coarse-grained igneous rocks have large crystals due to slow cooling.

Front

What is magma?

Back

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