Having reviewed a wide range of elements for different assumptions about the cause of the extinction mass which affected the dinosaurs and many other agencies there are 65 million years, a team of international scientists concluded that it was indeed caused by the shock one Asteroid  the site of Chicxulub in Mexico currently.

The extinction that marks the Cretaceous-Paleogene was one of the largest in Earth history and geological traces of shock were found in sedimentary layers of the time in different places on the planet. If the shock is widely recognized as the cause of mass extinction, some continue to think differently and say for example that the microfossils of the Gulf of Mexico show that it occurred well before the extinction and can not therefore the explain. The massive volcanism that produced the Deccan Traps in India at that time has also been suggested as the main cause of possible extinction. In an article Science Peter Schulte of the University  Erlangen-Nuremberg in Germany, and a team of researchers spread across the world are the synthesis of data geological support the hypothesis of shock. They show that such an event could cause immediate waves devastating impact, a big whiff of heat  and tsunamis throughout the Ground. Furthermore, the release of a large quantity dust, debris and gas  could lead to a prolonged cooling at surface  Earth and a decrease in light  solar and ocean acidification, which then could decimate the photosynthetic plants and species that depended on it. Source: Science & AAAS EurekAler