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 …

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Photographs and information for a large collection of igneous, metamorphic and sedimentary rocks. Geology.com

Feb 6, 2026 · Since rocks are aggregates of mineral grains or crystals, their properties are determined in large part by the properties of their various constituent minerals.

Jul 9, 2023 · Learn about the three types of rocks: igneous, sedimentary, and metamorphic. Learn their characteristics and get examples of each type.

Jun 19, 2025 · 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 …

Aug 26, 2025 · 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.

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.

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The following are terms for rocks that are not petrographically or genetically distinct but are defined according to various other criteria; most are specific classes of other rocks, or altered versions of …