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Vocab234
Question | Answer |
---|---|
eon | the longest unit of geologic time |
eras | eons are subdivided into smaller units of time |
periods | eras are subdivided into periods |
epochs | periods are divided into epochs |
mass extinction | the extinction of many species on earth within a short period of time |
land bridge | connects two continents together that were previously separated |
geographic isolation | The separation of a population of orgasms from the separation of the rest of its species |
Paleozoic era | the oldest era of the phonetician eon |
mesozoic | the middle era Phanerozoic |
Cenozoic era | the youngest era |
Inland sea | a body of water formed when ocean water floods continents |
coal swamp | an oxygen-poor environment where, over time, plant materials changes into coal oils |
supercontinent | an ancient landmass which separated into present daycontinents |