Describe a hypothesis that has been proposed for the extinction of many species ,including dinosaurs during 66 million years ago ?

One hypothesis proposed for the extinction of many species, including dinosaurs, 66 million years ago is the impact theory. This theory suggests that a massive asteroid or comet collided with Earth, causing widespread devastation and leading to the extinction of numerous species. The impact would have released a huge amount of energy, triggering wildfires, tsunamis, and a dramatic change in climate. The resulting environmental changes would have been catastrophic for many species, including dinosaurs, ultimately leading to their extinction. Evidence supporting this hypothesis includes the discovery of a layer of sediment containing high levels of iridium, a rare element found in asteroids and comets, dating back to the time of the mass extinction event. Additionally, the discovery of the Chicxulub crater in Mexico, which is believed to have been formed by the impact of a large asteroid, further supports the impact theory as a possible explanation for the extinction event.