Did tsunamis cause the dinosaur extinction?

No. Scientists believe that a giant meteor hit the Earth, killing all the dinosaurs and causing their extinction.

It is true that the extinction of dinosaurs is mostly due to the meteor that hit earth during the time but according to scientists, only around 60 percent of the organisms on earth died due to direct impact. Some other reasons the dinosaurs are extinct may have included climate change, competition, or volcanic eruptions. And on the part about tsunamis, there actually was a massive tsunami near the Gulf of Mexico after the disturbance of the meteor that swept nearly 180 miles inland. But it was the meteor that caused the tsunami and also then the meteor, not the tsunami that may have contributed to the extinction of dinosaurs.