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Unit 7

Changes to Earth's Surface

TermDefinition
weathering the breaking down of rocks on Earth's surface into smaller pieces
erosion the process of moving sediment from one place to another
deposition the dropping or settling of eroded materials
sedimentary rock a type of rock that forms when layers of sediment are pressed together
fossil the remains or traces of a plant or animal that lived long ago
mold an impression of an organism, formed when sediment hardens around the organism
cast a model of an organism, formed when sediment fills a mold and hardens
fossil fuel fuel, such as coal, oil, natural gas, formed from the remains of once-living things
index fossil a fossil of a type of organism that lived in many places during a relatively short time span
mass extinction a period in which a large number of species become extinct
Created by: wmsScience
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