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14 Cards in this Set
- Front
- Back
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fossil
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The solidified remains or imprints of a once-living organism.
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relative dating
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Determining whether an event or object, such as a fossil, is older or younger than other events or objects.
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absolute dating
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Determining the age of an object or event in years, usually by measuring the amount of unstable atoms in the sample.
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geologic time scale
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The division of Earth's history into distinct intervals.
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extinct
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Describes a species of organism that has died out completely.
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Precambrian time
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The period of geologic time scale beginning when the Earth originated 4.6 billion years ago to about 540 million years ago.
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Paleozoic era
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The period of geologic time scale beginning about 570 million years ago and ending about 248 million years ago.
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Mesozoic era
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The period of geologic time scale beginning about 248 million years ago and ending about 65 millions years ago.
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Cenozoic era
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The period of geologic time scale beginning about 65 million years ago and continuing until present day.
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primate
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A type of mammal that includes humans, apes, and monkeys with opposable thumbs and binocular vision.
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hominid
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The family referring specifically to humans and several extinct, humanlike species.
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australopithecine
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An early hominid that evolved more than 3.6 million years ago.
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Neanderthal
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A species of hominid that lived in Europe and western Asia from 230,000 years ago to 30,000 years ago.
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plate tectonics
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The study of the forces that drive the movement of pieces of Earth's crust around the surface of the planet.
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