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18 Cards in this Set
- Front
- Back
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fossil
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the preserved remains or traces of living things
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paleontologist
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a scientist who studies fossils to learn about organism that lived long ago
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sedimentary rock
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the type of rock that is made of hardened sediment
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petrified fossil
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a fossil in which minerals replace all or part of an organism
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mold
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a fossil formed when an organism buried in sediment dissolves leaving a hollow area
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cast
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a fossil that is a copy of an organism's shape formed when minerals seep into mold
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carbon film
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a type of fossil consisting of an extremely thin coating of carbon on rock
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trace fossil
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a type of fossil that provides evidence of the activities of acient organisms
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scientific theory
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a well tested concept that explains a wide range of observations
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evolution
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the process by which all the diffrent kinds of living things have changed over time
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extinict
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describes a type of organism that no longer exist on earth
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law superpostition
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principle that says horizontal layers of sedimentary rock each layer is older than the layer above it and younger than the one below it
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uncomformity
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a place where an old, eroded rock surface is in contact with a newer rock layer
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index fossil
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fossil of widely distributed organism that lived during only one short period
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radioactive decay
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the breakdown of a radioactive element releasing particles and energy
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intrusion
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a igneous rock layer formed when magma hardens beneath earths surface
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extrusion
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an igneous rock layer formed when lava flows onto earths surface and hardens
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half-life
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the time it takes for half of the atoms of a radioactive element to decay
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