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Rocks Rocks Rock!!!! • When you classify objects, you organize them into groups based on common characteristics. • What are some different ways you could classify these marbles? • What characteristics do you think scientists use to classify rocks? What are Rocks? What are Rocks? • Rock is a natural occurring solid mixture of one or more minerals and organic matter So what is a Mineral? So what is a Mineral? • Naturally formed solid matter that has a crystalline structure. How do you describe Minerals? How do you describe Minerals? • • • • • • Color Hardness Density Fracture Composition Texture Composition • Limestone is a rock composed of the minerals Calcite and Argonite. • Limestone= CaCO3 Grains • Fine Grain • Small crystals • Basalt • Med Grain • Granite • Coarse Grain • Crystals are large and can be seen with the naked eye • Conglomorate Rock Texture Fig. 5.1 Rock type Igneous Sedimentary Metamorphic Characteristics Three Types of Rocks Three Types of Rocks • Igneous • Sedimentary • Metamorphic • Write at least two paragraphs on how rocks can move through the rock cycle using at least 8 vocabulary terms. Genetic Classification of Igneous Rocks • Extrusive: … lava cools above ground. Ash Pumice Scoria Process of Intrusion • Intrusive rocks..... lava cools underground
