But once Gondwana took up its polar position in the late Ordovician, massive glaciers formed over Africa at the supercontinent's center. This heralded a 20-million-year ice age during which ...
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Supernovae Blamed For 2 Of Earth’s Mass Extinctions, The Devonian And OrdovicianTwo of Earth’s five confirmed mass extinction events could have been caused by nearby supernova explosions stripping the planet’s ozone layer, a new study argues. Although the explanation has been ...
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