For decades, scientists have debated what caused the globe’s fifth mass extinction, which marked the end of the Cretaceous period 66 million years ago. Perhaps it was the massive Chicxulub meteorite that crashed into what is modern-day Mexico’s Yucatan Peninsula—kicking up enough dirt and dust into the atmosphere to block sunlight and choke off much…

via Underwater volcanoes may have helped trigger Earth’s fifth mass extinction — Quartz

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