Approximately 66 million years ago, a mass extinction event
occurred. 80 percent of all animals were killed, including all non-
avian dinosaurs. no one knows for sure what caused this event,
although the leading hypothesis is that a giant meteor impacted the
earth releasing energy 1 billion times greater than that of an atomic
bomb. it's hypothesized that the impact created a dust cloud that
blocked the sunlight for up to one year. how could this massive
meteor impact have changed the climate so much as to cause this
global mass extinction?
