A comet collision with Earth caused abrupt environmental stress and degradation that contributed to the extinction of most large animal species then inhabiting the Americas, a group of scientists suggests. The catastrophic impact and the subsequent climate change also led to the disappearance of the prehistoric Clovis culture, and to human population decline. Now focus has turned to the character and distribution of nanodiamonds, one type of material produced during such an extraterrestrial coll...
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/k...
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/k...