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earth science rocks
| Term | Definition |
|---|---|
| trace fossils | provide evidence of animal activity,ex:footprints |
| fossils | preserved remains or traces of living things;shows activity. |
| petrified fossils | minerals replace all or part of the organism. |
| mold | a hollow in sediment in the the shape of an organism. |
| cast | a copy of the shape of an organism. |
| carbonfilm | crabon from an organism is left behind. |
| preserved remains | in tar,amber and ice. |
| geologic column | provides evidence about history of fossils on earth. |
| geologic time scale | shows that earth changes over time. |
| extiction | the death of every member of the species |
| rules of superposition | in sedimentary rock,the oldest layer is on the bottom;youngest on top. |
| original unconformity | sedimentary layers of rock are deposit horizontally(unless under sediment) |
| extrusion | lava that hardens on the surface. |
| intrusion | magma that pushes into rock. |
| relative age | age compared to other rocks. |
| absolute age | number of age since a rock formed. |
| index fossils | a fossil that is used to establish the age of a rock layer because the fossil is distinct,abundant,and widespread and the species that formed that fossil existed for only a short span of geologic time |
Created by:
dorian11
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