IGNEOUS ROCKS

Igneous rocks form when magma or lava cools and hardens every time a volcano erupts.

CLASSIFYING IGNEOUS ROCKS

• Origin (where it came from)
• Texture (how it feels)
• Mineral composition(grain size)

Igneous rocks can be used for building material, bridges, tools, soil, abrasive, and gravel.

EXAMPLES OF IGNEOUS ROCKS

• Rhyolite
• Pegmatite
• Basalt
• Granite
• Obsidian

Igneous rock started to form 4.6 billion years ago when Earth looked like a bubbling white ball.

Igneous rocks are made out of many different colors and minerals.

There are two different types of igneous rocks, intrusive, and extrusive rocks. Intrusive forms inside the earth. Extrusive rock forms on the earths surface.

Igneous rock starts the process of all other rocks and the Rock Cycle

Igneous rock is the easiest, and the most common to find, because every time a volcano erupts more is made.

Magma with high silica content usually forms a light-colored rock.

Magma with low silica content usually forms dark-colored rock.

Igneous rock is the fastest rock to form, unlike sedimentary rock that takes hundreds of years to get packed together.

Igneous rock is different from Metamorphic rock because Metamorphic is the change of rock and igneous is the cooling.