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13 Cards in this Set
- Front
- Back
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Fossils
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the remains, imprints, or traces or dead animals or plants
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Permineralized remains
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fossils that are spaces that are filled with minerals from ground water
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Carbon film
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a thin layer or film left from a dead organism and persevered as a fossil
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Mold
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a body fossil that forms when an organism decays, or dissolves, and leaves a cavity in rock
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Cast
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a type of body fossil that forms when minerals fill a mold and harden into rock
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Index Fossils
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the remains of species that lived for a short time, were numerous, and were found in many places
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Half-life
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time it takes for half of an isotope's atom to decay
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relative dating
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age of rocks is determined by looking or examining the position of rocks in a layer
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absolute dating
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use of properties of atoms in rocks and other objects to determine their age
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uniformitarianism
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principle that Earth's processes that are happening today are similar to those that happened in the past
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Superposition
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older rocks are on the bottom when undisturbed
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radioactive dating
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the number of protons in an atom is changed and a new element is formed
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inconformities
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gaps in rock records made when erosion happens
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