Rocks: Igneous, Metamorphic and Sedimentary - Geology.com
Photographs and information for a large collection of igneous, metamorphic and sedimentary rocks. Geology.com
Rock (geology) - Wikipedia
In geology, a rock (also called a stone) is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its chemical composition, and the way …
Rock | Definition, Characteristics, Formation, Cycle ...
Feb 6, 2026 · Rock, in geology, naturally occurring and coherent aggregate of one or more minerals. Such aggregates constitute the basic unit of which the solid Earth is composed and typically form …
What Is Rock? Types of Rocks, Their Formation, and Complete ...
A clear, scientifically grounded overview of what rocks are, how the three major rock types form, and why rock classification matters in geology and engineering.
Types of Rocks – Igneous, Sedimentary, Metamorphic
Jul 9, 2023 · Learn about the three types of rocks: igneous, sedimentary, and metamorphic. Learn their characteristics and get examples of each type.
Major Rock Types: Igneous, Sedimentary & Metamorphic Explained
Jun 19, 2025 · List of all Igneous, Sedimentary, and Metamorphic Rock Types with Pictures and Links to Specific Articles about each Type of Rock.
Rocks - Geology (U.S. National Park Service)
Aug 26, 2025 · Some rocks are made of the shells of once-living animals, or of compressed pieces of plants. What a rock is made of, the shapes of the grains, and how the grains fit together all provide …