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Published byAllison Booker Modified over 8 years ago
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I. Formation They are formed when hot, liquid rock, or magma, cools and solidifies (Hardens)
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II. Classification Igneous rocks are classified according to their composition and texture.
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4 basic types of textures Fine-Grained Coarse-Grained Glassy Porphyritic
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III. Magma vs. Lava Magma – molten material below the earth’s surface. Lava – molten material above the earth’s surface.
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A. Intrusive Igneous Rocks: Magma pushes into surrounding rock below the Earth’s surface Cools slower Large Crystals Think: (INSIDE)
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Examples:
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Did you know?!?! Granite is the most abundant intrusive rock!
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B. Extrusive Rocks: forms when magma erupts onto the Earth’s surface (lava), cools quickly very small or no crystals formed Think: (EXTERIOR)
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Example: Basalt is the most common EXTRUSIVE igneous rock!
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Did you know?!?! Another name for an Extrusive rock is a VOLCANIC rock
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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?
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http://www.youtube.com/watch?v=P qgHUPSTojY http://www.youtube.com/watch?v=P qgHUPSTojY Must write down TWO things you learned!!!! Be prepared to share!
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http://www.youtube.com/watch?v=rkGVE6 wNAzo A little Science Rap
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