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长期以来,科学界就对6500万年前恐龙灭绝一事争论不休,有时还很尖锐。有的研究人员说,从化石里发现了银白色的软金属锶(Sr),便是最好的证据,说明恐龙是被剧烈的酸雨消灭的。这事发生在6500万年以前一个巨大的陨星袭击地球之后。斯克里普斯海洋研究所化学家丁·道格拉斯·麦克多戈尔说,“那场酸雨的腐蚀性,不亚于电池的酸溶液”。“这种高浓度的酸雨一连下了好几年,所以肯定会使某些种类的恐龙和其它许多物种走向灭绝。”他的这项研究结果势必引起新的争论。许多宇宙学家和地质学家在辩论中支持灾变说,即认为当地球遭到陨星或陨石雨的袭击之后,尘埃蔽天,太阳失色,地球行星变冷变暗,食用植物的死亡引发了动物界的
For a long time, the scientific community had argued about the extinction of 65 million dinosaurs ago, sometimes sharply. Some researchers said that silver-white strontium (Sr) was found in fossils, which is the best evidence that dinosaurs are extinct by intense acid rain. This happened after a massive meteorite struck the Earth 65 million years ago. Says Doug Griffith McDougall, a chemist at the Scripps Institution of Oceanography, “That acid rain is as corrosive as a battery acid solution.” “This high concentration of acid rain has been going on for years, so it is certain that some species of dinosaurs and many other species will be extinct.” The results of his study are bound to spark new controversy. Many cosmologists and geologists support the cataclysmic argument during the debate that the dust, the sun, the Earth’s planets become colder and darker after the earth was attacked by meteorites or meteorite rains, and the death of food plants triggered the animals Boundary