Igneous Rocks - Running head: IGNEOUS ROCKS 1 Igneous Rocks...

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Running head: IGNEOUS ROCKS 1 Igneous Rocks Melanie L. Moran SCI/245 June 24, 2011 Sherrill Wible
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IGNEOUS ROCKS 2 Igneous Rocks The oldest rock, igneous rocks form from solidification of magma. Molten materials from plutons rising from the Earth’s surface do to subduction of plates or hot spots in the mantle or divergent plate boundaries with basaltic magma. They cool and solidify on the surface. Extrusive and intrusive are the types of igneous rocks. Extrusive is from magma flow caused by volcanic activity and is on the Earth’s surface (lava). Intrusive occurs when magma solidifies at depths below the earth and is known as plutonic (Tulane University, 2003). Igneous rocks are one of three major rock types, and basically are rocks that solidify from magma that is in a hot liquid form. When the lava cools it becomes rock. Another method of igneous rock is composed from chemical composition. This fact provides the petrologist who determines the true origin of rocks from plate tectonics. Mineral components of rocks are also called modal method are found in
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This note was uploaded on 07/31/2011 for the course SCI 245 taught by Professor N/a during the Spring '09 term at University of Phoenix.

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Igneous Rocks - Running head: IGNEOUS ROCKS 1 Igneous Rocks...

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