Rocks
Igneous, sedimentary & metamorphic rocks
Igneous , Sedimentary, Metamorphic are rocks changed by magma or magma that changes into those rocks. There are there are three kinds of rocks Igneous Sedimentary, Metamorphic.
The first rock is called igneous. igneous are formed when rock (magma) cools and solidifies, with or without crystallization, either below the surface. This magma can be derived from partial melts of pre-existing rocks in either the earths mantle or crust. Typically, the melting is caused by one or more of the following proceses. an increase in temprature a decrease in pressure, or a change in composition. Over 700 types of igneous rocks have been described, most of them formed beneath the surface of the Earth's crust.
Igneous rocks make up approximately ninety five percent of the upper part of the Earth's crust. Igneous are important because their minerals and chemistry give information about the compisition of the earths......
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