Igneous Rocks

_____ rock is igneous rock that formed when magma hardened beneath the surface of the Earth

____ is the most abundant type of intrusive rock in continental crust

The texture of an igneous rock depends on the ____ and the _____ of its mineral crystals

• size

• color

• composition

• shape

_____ is igneous rock that lacks a crystal structure

What type of igneous rock is the exception to the following rule- the texture of an igneous rock depends on the size and shape of its mineral crystals?

• volcanic glass

• coarse-grained rocks

• porphyry

• intrusive rock

What forms fine-grained igneous rocks with small crystals or no crystals at all?

• pressure from the earth

• wind

• rapidly cooling lava

• slowly cooling lava

What forms coarse-grained rocks, such as granite, with large crystals?

• pressure from the earth

• wind

• rapidly cooling lava

• slowly cooling lava

Tags

NGSS.MS-PS1-4

Intrusive rocks have ______ grains than extrusive rocks

• smaller

• larger

• the same length

• wider

Extrusive rocks have a _____ or ______ texture

• fine-grained

• coarse-grained

• opaque

• glassy

Igneous rocks are classified by their _____, _____, and _____

• origin

• texture

• color

• mineral composition