Upgrade of Java Quiz: Rocks

Rocks are an earth material usually composed of a mixture of one or more minerals. They are separated into three families (igneous, sedimentary, and metamorphic) based on their mode of formation. Igneous rocks form from magma by crystallization, sedimentary rocks form from sediment by lithification, and metamorphic rocks form from pre-existing rocks when they are altered.

Russell J. Wernlund

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