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30 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Fossil |
The remains of a prehistoric organism. |
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Organisms |
Individual animal, plant, or single celled life form. |
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Cast fossil |
Formed when animal, plant or other organism dies. |
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Mold fossil |
Dead organism covered by sediments. |
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Trace fossil |
Footprint, trail, burrow, or trace of an animal. |
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Petrified/permineralized fossil |
Minerals soak into buried remains changing to rock. |
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Preserved fossil |
Organisms are prevented from decaying. |
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Carbonized fossil |
Organisms are pressed between soft mud/clay. |
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Fossil record |
Info about past life and environment on Earth. |
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Diversity |
A range of different things. |
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Relative age |
Does not tell exact age of an object. |
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Absolute age |
Exact age. |
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Index fossils |
Found in a short range of time. |
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Law of superposition |
Layers on top are younger than ones below. |
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Trilobites |
Index fossil that was abundant in Paleozoic Era. |
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Geologic Time Scale |
Record of major events in Earth's history. |
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Era |
Second largest on time scale. |
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Period |
Third largest on time scale. |
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Epoch |
Smallest on time scale. |
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Precambrian Eon |
Earliest span of time with volcanic activity. |
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Paleozoic Era |
Many organisms started appearing. |
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Mesozoic Era |
Age of the dinosaurs. |
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Cenozoic Era |
Age of ice ages and mammals. |
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Quaternary period |
Most recent period in Cenozoic Era. |
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Holocene epoch |
Current time. |
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Natural selection |
Process that explains how species change over time. |
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Adaptation |
Trait that helps an organism survive. |
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Variation |
Differences among populations. |
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Population |
Organisms of the same group or species. |
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Species |
Type of organism. |
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