Igneous Rocks Lesson

Igneous Rocks

Intrusive and Extrusive

Multiple Choice

Which type of landform produces lava?

• Volcanoes
• Mountains
• Plains
• Canyons

Multiple Choice

Which letter shows lava?

• A

• B

• C

Multiple Choice

Which letter shows magma?

• A

• B

• C

IGNEOUS ROCKS

are produced by fire!

Igneous rocks are formed when molten rock cools and hardens.

THERE ARE 2 TYPES:

1. Extrusive (cool outside Earth)

2. Intrusive (cool inside Earth)

Multiple Choice

How do igneous rocks form?

• Igneous rocks are formed by heat and pressure

• Igneous rocks are created by volcanic ash
• Molten rock cools and solidifies
• Igneous rocks form through weathering and erosion

Multiple Choice

What are the two types of igneous rocks?

• Large and small

• Sedimentary and metamorphic
• Basalt and granite
• Intrusive and extrusive

Rock are classified as intrusive or
extrusive based how they were
formed.

We can tell whether a rock is
intrusive or extrusive by looking at
the size of its crystals.

Intrusive rocks have larger crystals because they cool slower inside of the Earth.

Extrusive have smaller crystals
because they cool so fast on the Earth's surface.

Multiple Choice

Which type of igneous rock forms outside the Earth?

• Intrusive

• Extrusive

Multiple Choice

Which type of igneous rock forms inside the Earth?

• Intrusive

• Extrusive

Multiple Choice

Which type of igneous rock cools quickly make little/no crystals?

• Intrusive

• Extrusive

Multiple Choice

Which type of igneous rock cools slowly and forms large crystals?

• Intrusive

• Extrusive

To Review…

Igneous Rocks

Extrusive

Intrusive

Cool inside Earth

Cool slowly

Obvious crystals

Cool above surface

Cool quickly

Few to no crystals

Form when

molten rock cools

and hardens

Granite

Gabbro

Obsidian

Basalt

Multiple Choice

Which rock has large crystals?

• A

• B

• C

Multiple Choice

Which rock has small crystals?

• A

• B

• C

Multiple Choice

Which rock has no crystals?

• A

• B

• C

Multiple Choice

Which rock cooled the quickest?

• A

• B

• C

Multiple Choice

Which rock cooled the slowest?

• A

• B

• C

Multiple Choice

What type of igneous rock is this?

• Intrusive because it has large crystals

• Intrusive because it has small crystals

• Extrusive because it has large crystals

• Extrusive because it has small crystals

Multiple Choice

What type of igneous rock is this?

• Intrusive because it has large crystals

• Intrusive because it has small crystals

• Extrusive because it has large crystals

• Extrusive because it has small crystals

Multiple Choice

What type of igneous rock is this?

• Intrusive because it has large crystals

• Intrusive because it has small crystals

• Extrusive because it has large crystals

• Extrusive because it has small crystals

Multiple Choice

What type of igneous rock is this?

• Intrusive because it has large crystals

• Intrusive because it has small crystals

• Extrusive because it has large crystals

• Extrusive because it has small/no crystals

-Gas Bubbles
-Glassy surface

​

​Other characteristics of Igneous Rocks:

​Common Igneous Rocks: