Rocks October 9, 2014 Rock • a mixture of minerals, rock fragments, volcanic glass, organic matter, and other natural materials Sediment • Loose material: like tiny pieces of rocks, mineral grains from rocks, bits of shell and remains of living things that are moved by wind, water, ice, or gravity. Rock Cycle • The process that creates and changes rocks • Shows how rocks can change from one type to another Compaction • The process where layers of sediments are pressed together to form rock Cementation • The process where sediments are held together by dissolved minerals produced when water moves through rock Weathering • The process where air, water, or ice breaks down rocks into smaller and smaller pieces Erosion • The movement of weathered material (Sediments) Magma • Melted rock under Earth’s surface Exit Pass 1. Choose three words and use them in a sentence. Types of Rocks • IGNEOUS ROCKS • SEDIMENTARY ROCKS • METAMORPHIC ROCKS Igneous Rocks: • A rock formed from cooled and hardened magma or lava. Sedimentary Rocks: • A rock formed when sediments are pressed and cemented together, or when minerals form from solutions Metamorphic Rocks: • A rock that has been changed because of changes in temperature and pressure, or the presence of hot, watery fluids