Chapter 4: Lesson 2:Igneous Rocks Quiz

Which factor does NOT affect the type of igneous rock that forms?

• The composition of magma

• The rate at which magma cools

• The size of the erupting volcano

Which rocks form when lava cools on Earth’s surface?

• Intrusive

• Extrusive

• Coarse-grained

Which igneous rock has no visible crystals?

• gabbro

• granite

• obsidian

Why does pumice, an igneous rock, have holes?

• It forms from gas-rich lava.

• It forms deep beneath Earth’s surface.

• It forms from magma that is rich in silica.

Intrusive igneous rocks are made of

• small particles of ash.

• mostly volcanic glass.

• large, interlocking crystals.

Which term does NOT describe the texture of an extrusive igneous rock?

• layered

• fine-grained

• coarse-grained

In addition to texture, which factor is also used to classify igneous rocks?

• overall color

• pressure and temperature

• the type of cement between the grains

All igneous rocks are formed from

• cementing and compacting of rocks

• heat and pressure within the Earth

• the remains of ancient organisms

• magma and lava

Where do intrusive rocks form?

• Inside the Earth

• In outer space

• At the bottom of the ocean

• On the Earth's surface

This rock cooled on the outside of a volcano and contained air bubbles when it was forming. What type of rock is this?

• Sedimentary
• Igneous
• Metamorphic