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science chapter 8
fossils
| Question | Answer |
|---|---|
| In what type of rock will you find fossils? | sedimentary |
| What has to happen quickly to a dead organism to become a fossil? | covered |
| Which parts of an organism are morelikely to be preserved as fossils | bones & teeth |
| What makes fossils petrified | cells are replaced by minerals |
| How are remains preserved | in amber or ice |
| All information that scientists have gathered about the past life is called the | fossil record |
| How do evidence of fossils help scientists understand Earth's history | shows earth's organisms and climate from the past |
| compareing older rocks to younger rocks is | relative age |
| the number of years since the rock was formed | absolute age |
| The idea that bottom layers are older and the further you go up the layers are younger | the Law of Superposition |
| Intrusive, extrusive, faults, and unconformity are clues about | rock layers relative age |
| index fossils are important because they tell | relative age of layers |
| Two things that an index fossil must be in order to be considered an index fossil: one is widely distributed and | organisms existed only briefly |
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