Maybe that is why Atlantis or Lemuria disappeared?
The Clovis comet hypothesis, is one of the competing scientific explanations for the onset of the Younger Dryas cold period after the last glacial period.
The hypothesis, which scientists continue to debate, proposes that the climate of that time was cooled by the impact or air burst of one or more comets.
Though, the Clovis Comet hypothesis is highly controversia, the general hypothesis states that about 12,800 years ago, air burst(s) or impact(s) from a near-Earth object(s) set areas of the North American continent on fire, disrupted climate and caused the Quaternary extinction event in North America.
This resulted in the extinction of most of the megafauna, and the rapid demise of the North American Clovis culture.
The evidence in favour of a meteoric impact initiating the Younger Dryas cooling period includes carbon-rich layers of soil have been found at some 50 Clovis sites across North America.
Several layers containing anomalous materials were discovered at the very bottom of the 'black mats' of organic material that mark the beginning of the Younger Dryas.
It has been claimed that these anomalous materials cannot be explained by volcanic, anthropogenic, or other natural processes, and were therefore evidence of an impact event.
Here is the investigation with Carlos Rubia.