Background info

• Named for the Greek word meaning "from fire"

How does it form?

• Igneous rocks form when hot, molten liquid magma cools
• Pools of magma form deep underground and slowly work their way to the Earth's surface
• If they make it all the way, the liquid rock erupts and is called lava
• As the layers of lava build up they form a mountain called a volcano

types of igneous rocks

• Obsidian
• Basalt
• Pumice