Rock (geology) - Wikipedia Rocks form the Earth's outer solid layer, the crust, and most of its interior, except for the liquid outer core and pockets of magma in the asthenosphere The study of rocks involves multiple subdisciplines of geology, including petrology and mineralogy
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Major Rock Types: Igneous, Sedimentary Metamorphic Explained - Sandatlas Below is a list of major rock types that geologists recognize While there are many rock classifications (some overlapping), several terms and principles have remained widely accepted over time It all begins with igneous rocks
Rocks - Geology (U. S. National Park Service) Rocks are made up of different minerals, broken pieces of crystals, or broken pieces of rocks Some rocks are made of the shells of once-living animals, or of compressed pieces of plants
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Rocks Information and Facts - National Geographic Types of Rocks There are three basic types of rock: igneous, sedimentary, and metamorphic Extremely common in the Earth's crust, igneous rocks are volcanic and form from molten material