A significant meteor impact. The most recent mass extinction is the Cretaceous-Paleogene extinction event, which is also the only one that can be proven to have been caused by a significant asteroid impact.
When a planet is struck by a meteoroid, the surface is excavated, a process known as impact cratering. Impacts are immediate occurrences. They depart with many recognisable features.All nonavian dinosaur species, making up about 76 percent of all species on the planet, perished.
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