What have we learned Why do we think the dinosaurs were driven extinct by an impact
{"Image DocumentName": "What have we learned?Why do we think the dinosaurs were driven extinct by an impact?", "Image ImageDescription": "Careful analysis of sediments from the time of the dinosaurs\u2019 demise shows evidence of a major impact. An impact crater has been found, and we have a plausible scenario to describe how the impact led to the mass extinction. Do future impacts pose a real threat to our civilization? The probability of a major impact in our lifetimes is very low, but not zero. The threat is still being assessed.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}