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22 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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sedimentary rock
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The type of rock that is made of hardened sediment
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cast
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A fossil that is a solid copy of an organism's shape, formed when minerals seep into a mold
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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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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 ancient organisms
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paleontologist
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A scientist who studies fossils to learn about organisms that lived long ago
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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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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 different kinds of living things have changed over time
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extinct
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The process by which all the different kinds of living things have changed over time
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relative age
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The age of a rock compared to the ages of rock layers
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absolute age
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The age of rock given as the number of years since the rock formed
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law of superposition
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The geologic principle that stats that in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layers below it
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extrusion
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An igneous rock layer formed when lava flows onto Earth's surface and hardens
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intrusion
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An igneous rock layer formed when magma hardens beneath Earh's surface
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unconformity
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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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Fossils of widely distributed organisms that lived during only one short period
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topographic map
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A map that shows the surface features of an area
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contour line
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A line on a topographic map that connects points of equal elevation
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contour interval
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The difference in elevation from one contour line to the next
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index contour
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On a topographic map, a heavier contour line that is labeled with elevation of that contour line in round units
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