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types of rock - Rocks are broken up by the action of...

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Types of Rocks There are three main types of rocks: 1. 1. Igneous Igneous - formed when molten rock cools . 2. 2. Sedimentary Sedimentary – formed by the “cementing together” of small grains of sediment. 3. 3. Metamorphic Metamorphic – rocks changed by the effect of heat and pressure.
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Igneous Rocks These are rocks formed by the cooling of molten rock (magma.) magma volcano Magma cools and solidifies forming igneous rocks
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Sedimentary Rocks Sedimentary Rocks are rocks formed when particles of sediment build up and are “cemented together” by the effect of pressure and minerals. sea Fragments washed to the sea Sedimentary rocks
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Unformatted text preview: Rocks are broken up by the action of weather G e t i n g o l d r Metamorphic Rocks • Metamorphic rocks are formed by the effect of heat and pressure on existing rocks. • This can greatly affect the hardness, texture or layer patterns of the rocks. Magma metamorphic rock forming here heat Pressure from surface rocks This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching....
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