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Grade Six - Fossils
| Term | Definition |
|---|---|
| fossil | preserved remains or traces of living things |
| mold | hollow area in sediment in the shape of ancient organisms |
| cast | solid copy of the shape of an organism |
| petrified fossil | fossils in which minerals replace all or part of an organism |
| carbon film | an extremely thin coating of carbon on rock |
| trace fossil | fossils that provide evidence of the activities of ancient organisms |
| paleontologist | scientists that study fossils |
| scientific theory | a well-tested concept that explains a wide range of observations |
| evolution | gradual change in living things over a long period of time. |
| extinct | an organism that no longer exists and will never again live on earth. |
| relative age | age compared to the ages of other rocks. |
| absolute age | the number of years since the rock formed |
| law of superposition | the law used to explain how the oldest rock layers are at the bottom of layers of horizontally layered sedimentary rock and youngest rock is at the top. |
| extrusion | lava that hardens on the surface of the earth and is younger than the rock below it |
| intrusion | magma that oozes into cracks and between layers of rock beneath the crust and is younger than the around and beneath it. |
| fault | a break in the earth's crust and is always younger than the rock around it. |
| unconformity | a surface where new rock layers meet a much older layer leaving a gap in the geologic record |
| index fossil | a widely distributed, representative fossil that existed only briefly in time so the paleontologist can use it to compare layers of rock |
Created by:
pkolarich
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