恐龙的灭绝原因 英文

With regard to the reasons for the extinction of dinosaurs, it is still being studied. For a long time, the most authoritative view, and the extinction of the dinosaurs 6500 years ago about a large meteorite. According to the study, there was a 7-10 km in diameter asteroid will fall on the earth's surface, causing a large explosion, such as throwing a lot of dust in the atmosphere to form the Zhetianbiri House of Sand and Fog, led to the suspension of plant photosynthesis , And therefore the extinction of the dinosaurs.

Asteroid impact theory quickly gained the support of many scientists. In 1991, in Mexico's Yucatan Peninsula occurred in the discovery of a long period of the meteorite impact craters, the fact is further evidence of this point of view. Today, this view seems to have become a conclusion.

But there are also many people for such an asteroid impact on the skeptical, because the fact is: frogs, crocodiles and many other very sensitive to t