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What are Rocks? Cornell Notes pg. 129 What is a Rock? • Naturally Occurring • Solid • Mixture of one or more minerals • May contain organic matter Discuss… 1. How are Rocks and Minerals similar? 2. How are they different? Classifying Rocks • Rocks are divided into three main categories based on how they were formed – Igneous – Sedimentary – Metamorphic Classifying Rocks • By composition- the minerals a rock contains. – Granite= quartz + biotite + feldspar – Limestone= calcite + argonite • By texture- the size, shape, and positions of the grains. Think… • Do rocks always stay the same? How do rocks change? • Weathering- rocks are broken down into smaller rocks and sand, (sediment) • Erosion- sediment is removed from its source. • Deposition- area where sediment comes to a rest. • Heat and Pressurecan morph the rock or even cause the rock to melt and form magma. What is the Rock Cycle? • Continual process by which new rock forms from old rock • Rock may be changed from one type to another – Rock is Recycled!