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Cataclysm (Noun)

A sudden violent change in the earth's surface.

Nouns denoting natural phenomena.

The massive earthquake triggered a cataclysm that reshaped the coastline and caused widespread destruction.
The cataclysm that occurred 65 million years ago, known as the K-Pg extinction event, is believed to have been caused by a massive asteroid impact.
The volcanic eruption was so powerful that it caused a cataclysm, burying the surrounding area under a thick layer of ash and rock.
The cataclysm that occurred in the region 10,000 years ago, known as the Missoula Floods, was one of the most significant geological events in North American history.
Scientists believe that a cataclysm, possibly triggered by a comet impact, caused the sudden and extreme cooling of the Earth's climate at the end of the Younger Dryas period.

An event resulting in great loss and misfortune; "the whole city was affected by the irremediable calamity"; "the earthquake was a disaster".