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lessons 7.1,7.2

eons the longest units of geologic time
era eons are subdivided into smaller units of time
period eras subdivided into periods
epoch periods are subdivided into epochs
mass extinction the extinction of many species on Earth within a short period of time
land bridge connects two continents that were previously separated
geographic isolation 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 the oldest era of the Phanerozoic eon
Mesozoic era the middle era of the Phanerozoic eon
Cenozoic era the youngest era of the Phanerozoic eon
inland sea is a body of water formed when ocean water floods continents
coal swamp an oxygen-poor environment where, over time, plant material changes into coal
supercontinent an ancient landmass which separated into present-day continents
Created by: spiveshy5637