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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
Created by: nicossam3865