Igneous vocab

How do coarse-grained intrusive igneous rocks form?

• from sedimentary rocks changed under pressure

• from large rock particles cemented together

• from rapidly cooling lava

• from slow cooling magma

Extrusive rocks have larger grains than intrusive rocks.

• True

• False

When all the grains in a rock are large and easy to see, the rock is described as

• Fine-grained

• Coarse-Grained

• Glassy

An igneous rock that is formed from lava is called an

• Extrusive

• Intrusive

The slower magma cools, the smaller the mineral crystals form.

• True

• False

Extremely rapid cooling of lava in which no crystals form, creates what type of texture?

• Fine-Grained

• Coarse-Grained

• Glassy

How do extrusive igneous rocks form?

• from lava that erupted onto Earth's surface

• from magma that hardened beneath Earth's surface

How do intrusive igneous rocks form?

• from lava that erupted onto Earth's surface

• from magma that hardened beneath Earth's surface

Fine-grained igneous rocks with small crystals formed from

• rapidly cooling lava

• slowly cooling magma

Coarse-grained igneous rocks with large crystals formed from

• rapidly cooling lava

• slow cooling magma