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extinction mass permian great dying life earth occurred end million period history ago years artwork today similarities erased nearly scientists
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earth pangea ultima million years now day times supercontinent imagining graphics artist
earth pangea formed years ago million permian period system blakey ron map continent solar history geology nau credit during super
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pangaea supercontinent pangea oxygen if map earth genesis high resolution contributed reduced dying world great during maps africa time south
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pangaea earth pangea supercontinent apart broke breakup paleo continents benua terra earths paleomap palaeogeographic disintegration reconstruction overview theconversation