Mass Extinction
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<speciesfyi-glossary slug="mass-extinction"></speciesfyi-glossary>Definition
A widespread event in which a significant proportion of all species on Earth become extinct in a geologically short period.
Detailed Explanation
There have been five major mass extinctions in Earth's history: the Ordovician-Silurian, Late Devonian, Permian-Triassic (the largest, eliminating ~96% of marine species), Triassic-Jurassic, and Cretaceous-Paleogene (which ended non-avian dinosaurs). Each was followed by millions of years of recovery and adaptive radiation into vacated niches. Scientists warn the sixth extinction — driven by human activity — is unfolding 100-1,000 times faster than past events.