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ROCKS Types and famous rocks What is a rock???? • A rock is a structure composed of one or more minerals Igneous Rocks • • • • Also called plutonic rocks Formed from magma intrusive rocks form underground extrusive rocks form above ground Extrusive Igneous Rock • Form on Earth’s surface • Cool quickly • • • • • 1. Basalt 2. Obsidian 3. Rhyolite 4. Trachyte 5. Andesite Other extrusive rocks… • Are called pyroclastic….formed from explosive volcanic eruptions…. • Rocks are porous 1. Pumice 2. Tuff Intrusive Igneous Rocks • form below Earth’s surface…. • cool slower • • • • 1. 2. 3. 4. Granite Diorite Peridotite Dolerite
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