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Rocks

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by

Sarah McMillan

on 20 April 2010

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Transcript of Rocks

Rocks Metamorphic rocks Igneous rocks Sedimentary rocks The Rock Cycle Metamorphic rocks form when an existing rock is changed by heat and pressure This happens when a rock comes in contact with magma or when a large area of rock is confronted with intense pressures and heat Metamorphic rocks are classified by their texture Marble is a metamorphic rock used for floor tiles, counter tops, statues etc. Slate was onced used for blackboards and is commonly used for floor and roofing tiles This rock is usually found in places where erosion has accurred pushing it to the surface Igneous rocks form when magma cools They are classified by their composition and texture A lighter coloured Igneous rock is called felsic because of its high percentage of feldspar minerals A darker coloured rock is called mafic and if its in between dark and light its ultramafic Igneous rocks are found at surfaces of places of currant or past volcanic erosion or glaciation Granite is a type of igneous rock used for long lasting monuments and decoratives for buildings Another example is Pumice. Its is used for decorative landscape stone because of its light weight. Sedimentary rocks are formed when a rock is broken into smaller pieces by wind, water, gravity or ice There is two types of Sedimentary rock:
-Clastic
-Chemical Clastic is made of other bits of rock and Chemical is formed as a precipitate out of solution Sedimentary rocks are used in gravel, medicines, makeup, toothpaste, paints and building components Sedimentary rock covers 75% of the Earths surface so can be found almost everywhere By Sarah McMillan
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