金沙集团官方网站最新登录网址:Did 'slushball' Earth help trigger the explosion of life?
EVIDENCE for a period in our planet’s history dubbed “snowball Earth” is melting away according to a new climate model, which also claims to explain the explosion of life around the same time. Around 700 million years ago, the popular theory goes, severe glaciation locked the whole of Earth’s surface under deep sheets of ice. This was thought to have been followed by a massive explosion of multicellular organisms when the ice eventually melted. Now W. Richard Peltier of the University of Toronto in Canada says that a snowball Earth “could never have occurred”. As temperatures dropped,