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60 Seconds

作者:宋槿  时间:2019-03-07 05:06:00  人气:

Rise of the dinos The collapse of tropical rainforests 300 million years ago paved the way for the rise of the dinosaurs. As the forests died back, early reptiles evolved a host of new lifestyles to cope, including eating plants and hunting each other (Geology, vol 38, p 1079). Toxic snow on Everest Following in Edmund Hillary’s footsteps? Don’t drink the water on your way up. Dangerous levels of arsenic and cadmium have been found in snow samples from Mount Everest, 7000 metres above sea level. Pollution from Asian industry is probably to blame (Soil Survey Horizons,