‘Mass Extinction’ vivifies the science of die-offs

Documentary explores causes of dinosaur disappearance, ‘Great Dying’

cliffs in Spain

These rocks in Spain helped geologists determine what killed the dinosaurs.

© HHMI J.B. Spector/Museum of Science and Industry

Mass Extinction: Life on the Brink
Premieres November 30
Smithsonian Channel

Anyone with a passing interest in dinosaurs knows that the beasts were killed off some 65 million years ago after a colossal asteroid struck Earth.