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Rocks and Minerals Tic-Tac
Rocks and Minerals Tic-Tac

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Classification of Minerals
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The Chemistry of Rocks in the Wissahickon Valley
The Chemistry of Rocks in the Wissahickon Valley

... as magma. Within the magma, differing minerals combine to form rocks with specific chemical and physical properties. Factors within the magma such as heat, pressure, and water content determine the manner in which minerals crystalize which determines the type of igneous rock that forms. Where the ma ...
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Igneous rock



Igneous rock (derived from the Latin word ignis meaning fire) is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava. Igneous rock may form with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. This magma can be derived from partial melts of pre-existing rocks in either a planet's mantle or crust. Typically, the melting is caused by one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition. Over 700 types of igneous rocks have been described, most of them having formed beneath the surface of Earth's crust.
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