Exploring Igneous Rocks: Types and Characteristics

What is the origin of the name 'igneous'?

• It is derived from an Egyptian word for air.

• It is derived from a Roman word for earth.

• It is derived from a Greek word for fire.

• It is derived from a Latin word for water.

Where do intrusive igneous rocks form?

• On the surface of the Earth

• Inside the Earth

• In the ocean

• In the atmosphere

What is the texture of extrusive igneous rocks?

• Fine

• Coarse

• Rough

• Granular

Which type of igneous rock cools quickly?

• Extrusive

• Intrusive

• Both cool at the same rate

• Neither cools quickly

What is the silica content range for mafic rocks?

• 0 to 45 percent

• 45 to 65 percent

• 65 to 85 percent

• 85 to 100 percent

What color are felsic rocks typically?

• Red

• Light

• Blue

• Dark

What minerals make up obsidian?

• Quartz, alkali, and feldspar

• Quartz, mica, and feldspar

• Plagioclase, feldspar, and pyroxene

• Feldspar, agite, and horn blend

Tags

NGSS.MS-PS1-1

Which igneous rock has a hardness between 5 and 5.5?

• Obsidian

• Granite

• Basalt

• Scoria

What is the texture of rhyolite?

• Smooth

• Coarse

• Fine

• Granular

Which igneous rock can float in water?

• Obsidian

• Granite

• Basalt

• Rhyolite