Rock, Definition, Characteristics, Formation, Cycle, Classification, Types, & Facts

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 recognizable and mappable volumes. The three major classes of rock are igneous, sedimentary, and metamorphic rock.

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Rock Identification & the Rock Cycle

A Beginner's Guide to Types of Rock: Igneous, Sedimentary, and

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What are Sedimentary Rocks? - Types, Formation, Uses, Facts

3 Main Types of Rocks and Their Properties

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Foliated Metamorphic Rocks Definition & Examples - Video

What Are Igneous Rocks? - A-Z Animals

Igneous Rocks - Geology (U.S. National Park Service)

Rock Definition, Characteristics, Formation, Cycle