Igneous Rock

People throughout history have used igneous rock for tools and building materials.

• True 
• False

Granite is used for cobblestones and in landscaping.

• True 
• False

Extrusive rock forms beneath Earth's surface.

• True 
• False

Magma that is low in silica usually forms light-colored rocks.

• True
• False

Igneous rocks are classified by their origin, texture, and minerals composition.

• True
• False

Extrusive rocks have larger grains than intrusive rocks. 

• True
• False

What is the best way to describe igneous rock?

• light and easily broken
• hard and dense
• soft and dense
• soft and smooth

What kind of igneous rock usually contains large crystals?

• Extrusive
• Intrusive

Rhyolite is an __________ igneous rock.

• intrusive
• extrusive

How do coarse-grained igneous rocks form?

• from rapidly cooling lava
• from slowly cooling magma