sedmintary rock, rock that forms when sediments are deposited in layers, compacted together and cemented in place naturally, radiometric dating, method for getting an exact age from a material using the amounts of radioactive isotopes in it, Radioactive isotopes, Carbon-14, Uranium-238, Uranium-235, half life, the amount of time it takes for half of the original amount of a radioactive isotope to decay, fossil, when a living organism is transformed into stone in sedimentary rocks, Fossils are only found, in sedimentary rocks, index fossil, a unique, short lived fossil that marks a specific geologic time period when it is found, fault, a large fracture in bedrock causing displacement across a rock layer...younger than every rock layer it cuts through, igneous intrusion, igneous material that is injected into bedrock cutting through layers...younger than every layer it cuts through, weathering, when rock/mineral material is broken down by physical or chemical means, physical weatehring, the breaking of rock down into pieces, chemical weathering, breaking down of rock material chemically changing its composition, sediment, weathered broken down rock and mineral materila, superposition, oldest rock layers are deposited first, youngest are deposited last...oldest on bottom, youngest on top, erosion, when weathered rock material is carried away by wind, water or gravity, unconformity, a surface that represents missing geologic time in the rock record due to either erosion or periods of non-deposition, stratigraphic correlation, the matching of rock layers to other rock layers of the same age in order toe determine the geologic history of a region and identify unconformities, types of physical weathering, wedging, abrasion, root wedging, frost action, weathering that occurs when rock materials are broken apart by the expansion of freezing ice, abrasion, weathering that occurs when small particles carried by wind/water chip away at rock materials, root wedging, when growing roots of trees break rocks apart, types of chemical weathering, dissolving, dissolution, oxydation, oxydation, when rock mateirals react with oxygen forming oxides such as rust, dissolfing/dissolution, when rock materials is chemically dissolved by acid or acid rain

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