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How Are Rocks Formed?

April 26, 2017formed rocks universe

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How Are Rocks Formed?

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Learn to read to read rocks and identify those formed by wind and water (sedimentary rocks), volcanoes (igneous rocks), and pressure (metamorphic rocks). Your neighborhood is full of secrets just waiting for you to dig up, and before you know it, you will have one gem of a collection.

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Our earth is composed of three main types of rocks, each having been formed in its own special way. The first type, igneus rock, was formed when hot (2,000°F.), melted rock material, magma, deep inside the earth rose to the surface during earthquakes, volcanic eruptions, or other movements of the earth’s crust. This magma cooled

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AIMS: 1. What are sedimentary rocks? 2. What are igneous rocks? 3. What are metamorphic rocks? MOTIVATION: Now that we know what rocks are and how to identify some of their properties, who can tell us how they think the rocks formed? Have students log on to http://www.fi.edu/tfi/units/rocks/rocks.html to find out what forms rocks. (Pressure, temperature, erosion and friction). Show students pictures of each type of rock and ask them to identify their properties. The sedimentary rock is sandstone from Utah. It was taken from http://www.rocksforkids.com/howrocks.html#Sedimentary. The igneous rock is granite. The picture is from http://www.ivyhall.district96.k12.il.us/4th/kkhp/RocksandMinerals/granite.html. The metamorphic rock is quartz. The picture is from http://www.ivyhall.district96.k12.il.us/4th/kkhp/RocksandMinerals/metamorphic.html. For a student database, click here.