Igneous Rocks Ch.2 Sec. 3

Rocks that form when magma ______ and hardens are called igneous rocks.

• heats

• cools

The texture of an igneous rock is determined by the number of _____ the rock contains.

• cracks

• crystals

Intrusive rocks form when magma cools _____ below the earth's surface.

• quickly

• slowly

Magma that reaches the earth's surface becomes _____.

• lava

• gas

Extrusive rocks form when magma reaches the earth's surface, becomes lava, and cools ______.

• quickly

• slowly

Igneous rocks can form above or below the earth's surface.

• True

• False

The only type of igneous rock is extrusive rock.

• True

• False

If a rock contains many crystals, its texture will be glass-like.

• true

• false

Magma that is trapped and insulated cools slowly.

• true

• false

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Magma reaches the earth's surface through volcanoes, mid-ocean ridges, and cracks in the ocean floor.

• true

• false

Tags

NGSS.MS-ESS2-1