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| a scientists who studies fossils to learn about organisms that lived a long time ago |
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| preserved remains or traces of living things |
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| the process by which all the different kinds of living things have changed over long periods of time |
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| when an organism no longer exists and will never again live on Earth. |
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| In horixontal sedimentary rock layers, the oldest layere are at the bottom, and the younger layers are near the top |
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| useful becasue they tell the relative ages of the rock layers in which they occur, and example is a Trilobites |
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| record of the life forms and geologic events in Earth's history |
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| age compared to the age of other rocks |
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| lava that hardens on the surface |
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| Magma that pushes into surrounding rock. It is always younger than the surrounding rock |
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| largest unit of time in the geologic time scale Examples are Paleozonic, Mesozonic, and Cenozionic |
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| smalles unit of time in the Geologic Time Scale |
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| 88% of Earth's history is in this time. |
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| Around 250million years ago, during the Permian Period, the continents joined to form this super continent |
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| used by geologist to determine the absolute age of rocks |
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| the number of years since the rock formed |
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