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7.1, 7.2

eon the longest unit of geologic time
era a large division of geologic time, but smaller than an eon
period a unit of geologic time smaller than an era
epoch a division of geologic time smaller than a period
mass extinction the extinction of many species on Earth within a short period of time
land bridge a landform that connects two continents that were previously separated
geographic isolation is the 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
Paleozoic era is the oldest era of the Phanerozoic eon
Mesozoic era is the middle era of the Phanerozoic eon
Cenozoic era is the youngest era of the Phanerozoic eon
inland sea is a body of water formed when ocean water floods continents
coal swamp is an oxygen-poor environment where, over time, plant material changes into coal
supercontinent is an ancient landmass which separated into present-day continents
Created by: grupeabi2506