End Of the Dinosaurs

 

About 65 million years ago, at the end of the Cretaceous Period, the Earth was affected by major changes to its environment. Animal and plant life were plunged into danger. It may only have taken one of these changes to affect life on Earth, or perhaps it was a combination of several. Whichever is the case, one thing is certain: dinosaurs became extinct at this time. Many theories exist to explain how dinosaurs died out.

 

In the 1990s a meteorite crater 180 km (110 miles) across, on the seabed off the Yucatán Peninsula, Mexico, was dated to the late Cretaceous Period. The rock that made the Chicxulub crater was 10 km (6 miles) across. The impact may have made so much dust that the Sun’s light was blotted out, leading to a mass extinction.