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Sedimentary Rocks Earth Systems I said click the middle Ok thank you. Was that so hard? When do sedimentary rocks form? When do sedimentary rocks form? • Sedimentary rocks start to form when fragments of existing rocks get broken down into sediments. Some More Stuff to Know Some More Stuff to Know • There are four major processes of forming sedimentary rocks Some More Stuff to Know • There are four major processes of forming sedimentary rocks • Weathering, Erosion, Deposition, and Compaction/Cementation. Some More Stuff to Know • There are four major processes of forming sedimentary rocks • Weathering, Erosion, Deposition, and Compaction/Cementation. • In that order of course. Weathering Weathering • Weathering is breaking down rock using agents of erosion. Weathering • Weathering is breaking down rock using agents of erosion. • Water, ice, wind or gravity. These are agents of erosion. Weathering • Weathering is breaking down rock using agents of erosion. • Water, ice, wind or gravity. These are agents of erosion. • Chemical weathering is when rocks get dissolved into new substances. Erosion Erosion • Erosion is the weathering of rock to break the rock down into sediments. Deposition Deposition • Deposition is when sediments fall out of the agent of erosion they are currently in Forms of Forming Sedimentary Rocks Forms of Forming Sedimentary Rocks • Compaction is a process the squeezes sediments together forming rocks Forms of Forming Sedimentary Rocks • Compaction is a process the squeezes sediments together forming rocks • Cementation is when dissolved particles in deposited in tiny spaces in sediments Types of Sedimentary Rocks Types of Sedimentary Rocks • There are two types of sedimentary rocks Types of Sedimentary Rocks • There are two types of sedimentary rocks • Clastic and Chemical/Biochemical Types of Sedimentary Rocks • There are two types of sedimentary rocks • Clastic and Chemical/Biochemical • They are classified by what they are made of Clastic Rocks Clastic Rocks • Clastic rocks are made of weathered bit of rock Chemical/Biochemical Rocks Chemical/Biochemical Rocks • Chemical rocks are made from dissolved particles that separate from water (normally after evaporation). Chemical/Biochemical Rocks • Chemical rocks are made from dissolved particles that separate from water (normally after evaporation). • Limestone is a very common chemical rock, and so is chalk Chemical/Biochemical Rocks • Chemical rocks are made from dissolved particles that separate from water (normally after evaporation). • Limestone is a very common chemical rock, and so is chalk • 90% of limestones from biochemical sediments Why do we care? Why do we care? • No seriously, why do we care? Fossils and Earth Aging Fossils and Earth Aging • Shapes in the rocks show the kinds of environments these rocks formed in. Fossils and Earth Aging • Shapes in the rocks show the kinds of environments these rocks formed in. • Fossils and the layers in these rocks help determine how old the rocks are and when they were formed.