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The Rock Cycle Janet Hong Jane Kim Jenny Kim Lynn Yi What is a Rock? A rock is a mixture of one or more minerals, glass, and sometimes, organic matter. Three main categories of Rocks: - igneous - metamorphic - sedimentary The Rock Cycle What is a Rock Cycle? Recycling the Earth’s material Lithification Process by which unconsolidated rock-forming materials are converted into consolidated or coherent state. Sediment lithification Sedimentary Rock Metamorphism A process whereby rocks undergo physical or chemical changes or both to achieve equilibrium with conditions other than those under which they were originally formed Sedimentary Rock metamorphism Metamorphic Rock Fusion Change of a substance from the solid to the liquid state, usually by the application of heat. Metamorphic Rock fusion Magma Crystallization Process through which crystals separate from fluid, viscous, or dispersed state. Magma crystallization Igneous Rock Weathering, Erosion, and Transfer Weathering:Response of materials once in equilibrium within earth's crust to new conditions at or near contact with water, air, or living matter. Erosion: Movement of material from one place to another on Earth's surface. Agents of movement include gravity, water, ice, and wind. Weathering, Erosion, and Transfer Transfer: to carry across Igneous Rock weathering/erosion/transfer Sediment Human Impact on Rock Cycle Rock cycle is an Earth interior system. It is rarely influenced by human. Basically the rock cycle is not affected by human impact. THE END AP ENVIRONMENTAL SCIENCE PERIOD 5