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Definition
| the preserved remains or traces of living things!!! |
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| a hollow area in sediment in the shape of an organism or shape of an organism!!! |
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| a solid copy of the shape of an organism!!! |
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| an extremely thin coating of carbon on a rock!!! |
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Definition
| provide evidence of the activities of ancient organisms!!! |
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Definition
| provides evidence about the history of life and past environments on Earth!they also show how different groups of organisms have changed over time!!! |
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Definition
| the change in living things over time!!! |
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| the rocks age compared to ages of other rocks!!! |
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Definition
| the number of years that have passed since the rock has formed!!! |
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Definition
| lava that hardens on the surface and hardens igneous rock!!! |
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Definition
| when magma cools and hardens into a mass of igneous rock formed below earths surface!!! |
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Definition
| fossils that are widely distributed and represented an organism that existed for a geologically short period of time!they are useful because they tell the relative ages of the rock layers in which they occur!!! |
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Definition
| when gaps in the geoloogical record and folding change the position in which rock layers appear!!! |
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Definition
| when the entire species is no longer living!!! |
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Definition
| the time it takes for half of the radioactive atoms to decay!!! |
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Definition
| the process in which elements break down over time and the elements release particles and energy!!! |
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Definition
| radioactive form of carbon!!! |
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Definition
| the radioactive form of potassium!!! |
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Definition
| the principle that states that the geologic processes that operate today also operated in the past!!! |
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Definition
| covers 88% of earth's history, ended 542 million years ago!!! |
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