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10 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Fossil |
The preserved remains or traces of an organism that lived in the past |
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Mold fossil
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Forms when sediments bury an organism and the sediments change into rock
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Cast fossil
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Forms when a mold is filled with SAMs or ,had that hardens into the shape of an organism
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Petrified/ per-mineralized fossil |
Forms when minerals soak into buried remains, replacing, the remains, and changing them into rock |
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Preserved fossil |
when entire organism or parts of organisms are prevented from decaying by being trapped in: Rock, ice, tar, amber |
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Carbonized fossil |
when organism are pressed between layers of soft mud or clay |
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Trace fossil |
When mud or sand hardens to stone where a footprint |
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Law of superposition |
each rock layer is older than the one above it |
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Relative age |
Approximate age |
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Absolute age |
Exact age |
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