The latest development in the debat

The latest development in the debate amongst scientists about what killed the prehistoric dinosaurs is the suggestion that acid rain was the cause. Two geologists from the Massachusetts Institute of Technology suggest that a large meteor hitting the earth at 65 kilometres per second would have led to strongly acidic rain falling all over the world.
The two geologists, Ronald Prinn and Bruce Fegley, calculated that if an ice-rich meteor weighing 12.5 million billion kilograms, hit the Earth, it would shock-heat the atmosphere enough to produce huge amounts of nitrogen oxides. This would result, they say, in strongly acid rain around the world. If the meteor were travelling more slowly, or if it were more rock-like in structure, this strongly acid rain would be limited to a small area so that the world effect would be much less important. However, other groups of researchers have suggested that volcanoes, rather than meteors, could have produced these heavy doses of acid rain, but over a much longer period — over 10,000 years.
Prinn and Fegley believe that their theory matches the pattern of animal and plant life at the end of the Cretaceous period 65 million years ago. It is well known from studying rock formations that it was at this time that dinosaurs and many other groups of prehistoric animals died out. Prinn and Fegley suggest one way in which their theory might be tested. Rock layers which have remained undisturbed since the Cretaceous era could be examined to see if they show any sign of the effects of very large amounts of acid rain on metals which do not dissolve in water such as iron and lead. Such undisturbed rock layers are, however, very rare.

Kết quả (Việt) 1:

The latest development in the debate amongst scientists about what killed the prehistoric dinosaurs is the suggestion that acid rain was the cause. Two geologists from the Massachusetts Institute of Technology suggest that a large meteor hitting the earth at 65 kilometres per second would have led to strongly acidic rain falling all over the world.The two geologists, Ronald Prinn and Bruce Fegley, calculated that if an ice-rich meteor weighing 12.5 million billion kilograms, hit the Earth, it would shock-heat the atmosphere enough to produce huge amounts of nitrogen oxides. This would result, they say, in strongly acid rain around the world. If the meteor were travelling more slowly, or if it were more rock-like in structure, this strongly acid rain would be limited to a small area so that the world effect would be much less important. However, other groups of researchers have suggested that volcanoes, rather than meteors, could have produced these heavy doses of acid rain, but over a much longer period — over 10,000 years.Prinn và Fegley tin rằng lý thuyết của họ phù hợp với các mô hình của cuộc sống động vật và thực vật tại cuối thời kỳ Cretaceous, 65 triệu năm trước. Nó là nổi tiếng từ nghiên cứu thành đá nó là lúc này thời gian khủng long và nhiều nhóm khác của động vật thời tiền sử diệt vong. Prinn và Fegley cho thấy một trong những cách mà trong đó lý thuyết của họ có thể được kiểm tra. Lớp đá mà vẫn không bị ảnh hưởng vì thời kỳ Cretaceous có thể được kiểm tra để xem nếu họ Hiển thị bất kỳ dấu hiệu của những ảnh hưởng của các số tiền rất lớn của mưa axít trên kim loại không hòa tan trong nước như sắt và dẫn. Các lớp đá không bị ảnh hưởng là, Tuy nhiên, rất hiếm.