10 Questions Mass Extinctions: Annihilation from Above! Test your knowledge of extinctions with a quiz aligned with the interactive "Dino Doom" learning experience on Infiniscope, a Science Mission Directorate project powered by NASA. NASA_Infiniscope, 01/18/2019 answers Play True or False: An asteroid impact contributed to the extinction of the dinosaurs. True False In what type of rock are we most likely to find fossils of extinct organisms like dinosaurs? igneous metamorphic sedimentary How many major extinctions have happened on Earth over the past 500 million years? 1 mass extinction 5 mass extinctions 50 mass extinctions 500 mass extinctions … and 7 more awesome questions! Check them out by clicking “Play”.