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12 Cards in this Set
- Front
- Back
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the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock. |
Fossils |
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Any method of determining whether an event or object is older or younger than other events in years |
Relative dating |
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Any method of measuring the age of an object or event in years |
Absolute dating |
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The standard method used to divide the earth's long natural history into manageable parts |
Geologic time scale |
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Describes a species that has died out completely |
Extinct |
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The theory that explain how large pieces of the earth's outermost layer called _____________, move and change shape |
Plate tectonics |
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The period in the geologic time scale from the formation of the Earth to the beginning of the paleozoic era, from about 4. 6 million to 542 million years ago |
Precambrian time |
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The geologic era that followed Precambrian time that and that lasted from 542 million to 251 million years ago |
Paleozoic era |
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The the geologic era that lasted from 251 million to 65.5 million years ago; also called the age of reptiles |
Mesozoic era |
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The most recent geologic era, beginning 65 million years ago; also called the age of mammals |
Cenozoic era |
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A type of mammals characterized by oppiosable thumbs and binocular vision |
Primates |
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The species of hominids that includes modern humans and their closest ancestors and that first appeared about 100,000 to 160,000 years |
Homo sapiens |
