Scientists have found dust from the asteroid that wiped out the dinosaurs inside the crater it left

More than 99% of all organisms that have ever lived on Earth are now extinct. Most of these just died out quietly. However, in Earth’s history there have been five major mass extinction events – known as the big five – during which many species became extinct at the same time.

Each of the big five events caused at least a 40% loss of all species on Earth.…

© La Conversation - mardi 2 mars 2021