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Download Rocks - Trimble County Schools
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What is a rock? Where do we find rocks? How are rocks classified? What is the Rock Cycle? What is a Rock? Naturally-occurring mixtures of minerals, glass or organic matter. Where do we find rocks? Rocks can be . . . Hard Soft Shiny Dull Smooth Rough One color Many colors Classifying Rocks Rocks are divided into 3 groups based on how they were formed: Rocks Igneous Sedimentary Metamorphic Igneous Rocks Igneous Rock is formed when magma or lava cools. Igneous rock can form: – underground, where the magma (a hot liquid) cools slowly OR – above ground, where the magma cools quickly. Igneous Rocks formed underground (from lava or magma) usually have LARGE crystal grains (they cooled slowly) Igneous Rocks formed above ground (from lava) usually have SMALL or NO crystals (they cooled too quickly) Sedimentary Rocks Sedimentary Rock is formed from sediments (rock fragments, mineral grains, animal & plant remains) that are pressed or cemented together. Sedimentary rocks form at or near the earth's surface at relatively low temperatures and pressures These sediments are moved by wind, water, ice or gravity. Sedimentary rocks are fossil-carrying rocks. They can be formed underwater, too, and can be made up of bits of shells and skeletons of sea animals. Metamorphic Rock Metamorphic Rocks are those that have changed due to intense temperature and pressure. Metamorphic rocks CHANGE FORM. Both igneous rocks and sedimentary rocks can change into metamorphic rocks Heat and pressure do not change the chemical makeup of the parent rocks but they do change the physical properties of those rocks. This rock has many layers. The Life of a Rock Layers of sediment join together. Igneous Sedimentary Rock Melted rock cools and hardens Metamorphic Changes are made from pressure and heat. Once a rock is formed, does it stay the same rock forever? NO! Rocks are continually changed by many processes, such as weathering, erosion, compaction, cementation, melting, and cooling Rocks can change to and from the three types Rocks become , and bigger, and bigger, and bigger . . . bigger By earthquakes By volcanoes By heat and pressure Rocks become smaller, and smaller, and smaller, and ... smaller By By By By By By erosion wind earthquake floods rain mudslides The Rock Cycle Song (Sing to the tune of "Row, Row, Row Your Boat") SEDIMENTARY rock Has been formed in layers Often found near water sources With fossils from decayers Then there's IGNEOUS rock Here since Earth was born Molten Lava, cooled and hardened That's how it is formed These two types of rocks Can also be transformed With pressure, heat and chemicals METAMORPHIC rocks they’ll be. This rock is formed by cooling magma. IGNEOUS This type of rock can be formed underwater. It is made up of bits of shells and skeletons of sea animals. SEDIMENTARY This rock is formed by intense heat & pressure. METAMORPHIC This rock is formed when tiny grains of sand become cemented together. SEDIMENTARY This rock is formed by quickly cooled lava. IGNEOUS IGNEOUS ROCKS ARE FORMED BY: Cooling Magma or Lava Sedimentary rocks are formed when tiny grains of _______ become cemented together. SAND Let’s Review A rock that has many layers, is flat, and comes apart easily is most likely which type? – A. granite – B. igneous – C. metamorphic – D. sedimentary
