A New History of Life

The Collapse of Earth's First Eden (1520x17)

Ημερομηνία προβολής: Ιαν 01, 2013

Five mass extinctions have occurred in the last 500 million years. Focus on the first of these, which extinguished the tropical paradise that flourished in the Ordovician period. Did plate tectonics initiate this radical transformation? Or could the cause have been extraterrestrial?