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Igneous Rock

Igneous Rock

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Igneous Rock

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  1. Igneous Rock Chapter 2 section2

  2. Origins of Igneous Rock • Begins as magma • Magma can form • When rock is heated • Pressure is released • Rock changes composition • When magma cools it solidified or becomes hard • Magma has many different minerals with different melting points

  3. Composition and Texture of Igneous Rock • Light colored rocks are less dense, rich in elements such as aluminum, potassium, silicon, and sodium and are called felsic rocks • Dark colored rock are more dense rich in calcium, iron and magnesium and are called mafic rocks • Fast cooling magma causes fine grained rock and slowing cooling magma causes course grained rock

  4. Igneous Rock Formation • Igneous rock forms above and below the earths • Intrusive Igneous Rock –forms below the earth surface and usually had course grained rock • Common intrusions • Plutons large and irregular bodies and • Batholiths are the largest • Stocks exposed over smaller areas • Dike sheet like and cut across previous rock • Sills sheet like that are parallel to previous rock

  5. Extrusive Rock • Extrusive Igneous Rock forms from magma that erupts or extrudes onto the earths surface • Cools quickly and has small crystals • Lava flows form from an eruption • Fissures are long cracks in earths crust where lava flows • Lava Plateaus are large amounts of lava that form a plain