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Definition
| preserved remains or traces of living things |
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Definition
| a hollow area in sediment in the shape of an organism or part of an organism |
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Definition
| a solid copy of the shape of an organism |
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Definition
| fossils in which minerals replace all of an organism |
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Definition
| an extremely thin coating of carbon on rock |
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Definition
| provide evidence of the activities of ancient organisms |
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Definition
| scientist who study fossils |
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Definition
| the change in living things over time |
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Definition
| if it no longer exists and will never again live on earth |
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Definition
| a rocks age compared to other rocks age |
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Definition
| the number of years that passed since the rock has been formed |
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Definition
| the way to determine the relative ages of sedimentary rock layers |
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Definition
| lava that hardens on the surface and forms igneous rock |
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Definition
| lava that hardens below the surface and forms igneous rock |
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Definition
| a break in the earths crust |
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Definition
| fossils that tell the relative age and the rock layers of rocks in the way they occur |
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Definition
| a gap in geological record |
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Definition
| the process when elements release particles and energy |
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Definition
| the time it takes for half of the radioactive atoms to decay |
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Term
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Definition
| is a record of the geologic events and the evolution of life forms as shown in the fossil record |
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Definition
| the 3 different time periods between precambrian and present time |
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Definition
| eras divided are subdivided into units of geological time called periods |
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Term
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Definition
| the key principle that guides scientists when they make inferences about earths past |
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