The Asteroid That Killed The Dinosaurs

Description:  It is estimated that 75% of plant and animal (including dinosaur) species went extinct after the Earth was hit with a massive asteroid 66 million years ago. Evidence includes a thin layer of rock containing iridium (rarely found on Earth but common in asteroids) around the planet. Scientists have also discovered a large impact crater. The cause of the extinction is fairly clear but the details of the effects leave much to be explored.

Web Resource:  Cretaceous–Paleogene extinction event - Wikipedia

Ever wonder why the dinosaurs disappeared? HHMI BioInteractive investigates the cause of the mass extinction at the end of the Cretaceous period-and the clues come from paleontology, chemistry, physics, and biology. This three-act film tells the story of the extraordinary detective work that solved one of the greatest scientific mysteries of all time.