I. Formation They are formed when hot, liquid rock, or magma, cools and solidifies (Hardens)

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Presentation transcript:

I. Formation They are formed when hot, liquid rock, or magma, cools and solidifies (Hardens)

II. Classification Igneous rocks are classified according to their composition and texture.

4 basic types of textures Fine-Grained Coarse-Grained Glassy Porphyritic

III. Magma vs. Lava Magma – molten material below the earth’s surface. Lava – molten material above the earth’s surface.

A. Intrusive Igneous Rocks: Magma pushes into surrounding rock below the Earth’s surface Cools slower Large Crystals Think: (INSIDE)

Examples:

Did you know?!?! Granite is the most abundant intrusive rock!

B. Extrusive Rocks: forms when magma erupts onto the Earth’s surface (lava), cools quickly very small or no crystals formed  Think: (EXTERIOR)

Example: Basalt is the most common EXTRUSIVE igneous rock!

Did you know?!?! Another name for an Extrusive rock is a VOLCANIC rock

A Closer Look at an Igneous Rock Obsidian is a dark-colored volcanic glass that forms from the very rapid cooling of molten rock material. It cools so rapidly that crystals do not form. Is it fine-grained or coarse-grained? Is this rock Intrusive or Extrusive? Is it fine-grained or coarse-grained? Is this rock Intrusive or Extrusive?

qgHUPSTojY qgHUPSTojY Must write down TWO things you learned!!!! Be prepared to share!

wNAzo A little Science Rap