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Scientists have known for some time that a giant asteroid smashed into Earth causing mass extinctions. But precisely how it happened was until now not understood.
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Determining what killed the dinosaurs 66 million years ago at the end of the Cretaceous Period has long been a source of discussion, as scientists try to figure out what caused the five big extinction events that changed life on Earth in a geological second.
Earth has experienced five mass extinction events over its 4.5 billion-year history. A sixth mass extinction is underway as a result of human-driven climate change.
Earth has experienced five mass extinction events over its 4.5 billion-year history. A sixth mass extinction is underway as a result of human-driven climate change.