Question:

What caused the dying?

Answer:

At the end of the Cretaceous there is now widespread evidence that a meteorite was at least the partial cause for the extinctions.

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Late Cretaceous Meteorite Alvarez hypothesis Cretaceous–Paleogene extinction event Cretaceous Cretaceous–Paleogene boundary Extinction event Historical geology Planetary science Climate history Impact events Cretaceous–Tertiary extinction event Alvarez hypothesis Geologic time scale Extinction events Cretaceous Meteorite Extinction Phanerozoic Environment Disaster Accident Disaster Accident
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