Igneous Rocks

(a)   rock is igneous rock that formed when magma hardened beneath the surface of the Earth

(a)   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

(a)   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