Chapter 4 Lesson 2 "Igneous Rocks"

Chapter 4 Lesson 2 "Igneous Rocks"

Rocks formed from cooled magma

Multiple Choice

On the surface magma is called

• magma

• lava

Multiple Select

What happens to lava to create igneous rocks?

• It gets hotter.

• It cools and crystallizes.

• It freezes.

Where are igneous rocks created?

on the surface and underground

Extrusive

Igneous rocks made above ground

Multiple Choice

Igneous rocks are made from cooling

• sediments

• magma

Multiple Choice

When lava cools quickly on the surface, there is not enough time for ___ to form, so igneous rocks like, obsidian, are created.

• ash

• minerals

• crystals

Multiple Choice

Sometimes _____ is trapped inside magma. And when the magma reaches the surface the ___ is able to escape thereby creating holes in igneous rocks like the pumice.

• gas

• crystals

• minerals

• water

What do we know about Extrusive Igneous Rocks?

• They are made from cooled magma.

• They are created on the Earth's surface.

• They cool too quickly for crystals to form inside them.

• The can have holes to show that gas has escaped.

Intrusive Rocks

Igneous rocks created beneath the Earth's surface

Intrusive Rocks

• Form underground

• Slow cooling

• crystals form

• crystals form mixed patterns inside the rock

Multiple Choice

Igneous rocks that form under the Earth's surface are called

• crystals

• extrusive

• intrusive

Multiple Select

Does an intrusive igneous rock have crystals?

• no

• yes

Multiple Select

Why do intrusive igneous rocks have mixed crystal patterns?

• the magma cools too slowly

• the magma cools too quickly

How can you tell an extrusive igneous rock from an intrusive igneous rock?

Texture and composition

Multiple Select

Since the magma cools too quickly on the surface crystals do not form. So if you don't see crystals it is an extrusive rock.

• True

• False

Multiple Select

Since magma cools down slowly underneath the surface crystals are able to form, so if you can see the crystals in weird patterns, it is an intrusive rock.

• True

• False