A massive impact crater tells that asteroid that killed dinosaurs was not alone.

"Discovery of a large impact crater beneath the North Atlantic Ocean reveals that more than one asteroid could have spelled doom for the dinosaurs". (ScitechDaily.com/Massive Impact Crater Beneath the North Atlantic Reveals Dinosaur-Killing Asteroid Wasn’t Alone)

There is the possibility that the asteroid which killed dinosaurs was not alone. Or maybe that astroid crushed in pieces before it impacted on the ground. There is the possibility that only some part of that asteroid hit to Yucatan peninsula. 

But it's possible that the Gulf of Mexico and Hudson's bay, along with Azov's sea form in the impact of large-size meteorites. The form of those bays tells that they could be the remnants of meteorite craters.  The fact is that the asteroid that killed dinosaurs was not the first or the last object that impacted Earth. Things like ice ages are also sometimes suspected to be the result of a meteor impact. 

When somebody says that volcanic eruptions killed dinosaurs we must realize one thing. When a large-size meteorite impacts Earth. That thing forms an extremely deep crater. That crater can make a hole in the Earth's core. And then magma starts to flow away from the hole. The meteorites caused nuclear winter. But the fact is that there was more than one mass extinction during history. 

When Earth was young there were more asteroids in our solar system. And that means that in the era before dinosaurs impacts were more usual than in modern times. When our solar system turns mature the number of asteroids decreases because of the impacts with planets. And that means the possibility that asteroid impacts on Earth are decreased. But that possibility still exists. 

https://scitechdaily.com/massive-impact-crater-beneath-the-north-atlantic-reveals-dinosaur-killing-asteroid-wasnt-alone/

Image:) https://scitechdaily.com/massive-impact-crater-beneath-the-north-atlantic-reveals-dinosaur-killing-asteroid-wasnt-alone/