geologic time
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| eon | longest units of geological time
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| era | eons are subdivided into smaller units of time into these
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| period | eras are subdivided into these
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| epoch | periods are subdivided into these
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| mass extinction | extinction of many species on Earth within a short period of timw
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| land bridge | connects two continents at were previously separated
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| geographic isolation | separation of a population of organisms from the rest of its species due to some physical barrier, such as a mountain range or an ocean
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| Paleozoic era | the oldest era of the phanerzoic eon
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| Mesozoic era | middle era of the phanerzoic eon
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| Cenozoic era | youngest era of the phanerzoic era
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| inland sea | body of water formed when ocean water floods continents
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| coal swamp | oxygen-poor environment, where over time, plant material changes into coal
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| supercontinent | ancient landmass which separated into present-day continents
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