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30 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Fossil |
preserved remains or traces of an organism that usually lived more than 10,000 years ago |
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Mold fossil |
Forms when sediments bury an organism, the sediments harden into rock, and the organism decays leaving a cavity |
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Cast fossil |
Forms when sediments soak into a mold and it hardens into a rock |
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Petrified/permineralized fossil |
Forms when minerals soak into the remains of decayed organisms and hardens |
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Preserved fossil |
Forms when an organism is kept from decaying by being preserved in amber made from tree sap |
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Carbonized fossil |
Forms an organism get compressed so much and the organism decays, leaving the carbon imprint of the organism |
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Trace fossil |
When an imprint left by an animal is preserved, such as a footprint or a burrow |
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Law of superposition |
The law that the further you go into Earth, the older it is |
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Relative Age |
an approximate age of a fossil or rock layer |
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Absolute age |
the exact age of a fossil or layer of rock |
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Index Fossil |
Fossils that are used to determine the relative age of layers of rock |
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Trilobite |
A common prehistoric animal and a good index fossil |
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Geologic Time Scale |
A record of every major event in Earth's history |
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Era |
Second largest measure of geologic time. |
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Period |
Second smallest measure of geologic time. |
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Epoch |
Smallest measure of geologic time. |
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Precambrian Eon |
Beginning of Earth's history, taking up 87% of it |
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Paleozoic Era |
The second era that began with an explosion of life and ended with a mass extinction |
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Mesozoic Era |
The era in which reptiles were dominant and we begin to see the first mammals and birds |
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Cenozoic Era |
Era after the dinosaurs and we live in it today |
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Volcanic Activity |
when volcanoes erupt and release ash, gas, and lava |
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Impact Events |
When an extra terrestrial object clashes into Earth |
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Climate Change |
When the overall weather and temp. changes |
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Natural Extinction Factors |
Factors that cause extinction that isn't man-made |
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Man-made Extinction Factors |
Factors that cause extinction that is made by humans |
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Adaptation |
something that an organism possesses that helps it survive and reproduce |
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Physical Trait |
A part of an organism's body |
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Behavior Adaptation |
How an organism acts |
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Variation |
Different types of the same species |
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Natural Selection |
The process that changes the population of an organism to fit its enviornment |
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