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30 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Fossil |
Remains of a living thing from the past
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Organisms |
A living thing |
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Cast Fossils |
When a fossil is created by chemical reactions |
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Mold Fossil |
When dead organisms covered in sediments turn into fossils |
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Trace Fossil |
Fossils that shows tracks like earthquakes |
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Petrified/Permineralized Fossil |
When water seeps in and leaves only hard minerals |
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Preserved Fossil |
A fossil that has been saved |
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Carbonized Fossil |
To save the fossil with no air flow |
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Fossil Record |
The placement of fossils in the earth |
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Diversity |
A range of different things |
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Relative age |
Approximate age |
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Absolute age |
Exact age |
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Index fossils |
Many of the same fossil must be found over a wide area |
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Law of Superposition |
Tells scientists how old the Earth,rocks, and fossils are |
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Trilobites |
An index fossil that became extinct about 245 million years ago |
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Geologic Time Scale |
Record of the major events and diversity of life forms present in Earths History |
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Era |
A subdivision of an Eon |
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Period |
A length of portion of time |
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Epoch |
A period of time in history or a persons life |
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Precambrian Eon |
Earliest span of time in Earths history |
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Paleozoic Era |
Sudden increase in the diversity of many animal phyla |
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Mesozoic Era |
Increase in Reptiles Age of Dinosaurs!!! |
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Cenozoic Era |
Humans appeared |
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Quaternary period |
Geologic time period that
encompasses the most recent 2.6 million years |
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Holocene epoch |
Started some 11,500 years ago when the glaciers began to
retreat |
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Natural Selection |
The process that explains how species can change over time. |
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Adaptation |
Trait or behavior that helps an organism survive. |
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Variation |
Differences that exist among populations of species. |
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Population |
Group of same organism |
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Species |
Type of organism |
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