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.

How Many Types of Rocks are there ?

5.1.1 How do rocks form? – Earth & Space Science

Metamorphic Rocks Lesson #14, Volcano World

igneous rocks formation and their classification

3 Types of Rocks, How are Rocks Formed, Igneous, Sedimentary

What is Rock, Types of Rocks and Classification

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

Foliated Metamorphic Rocks Definition & Examples - Video

Reading: Characteristics of Metamorphic Rocks

Classification of sedimentary rocks - The Australian Museum