The most severe ice age in history, a period of total glaciation known as Snowball Earth, ended suddenly 635m years ago when large amounts of methane were released from areas of permafrost.
历史上最严重的冰河期,被称为雪球地球(Snowball Earth)期,当时地球完全被冰层覆盖。6.35亿年前,永久冻结带释放出大量甲烷,这一时期突然结束。
On composing of glacial drifts, the terminal moraines represent the space positions which the cirques glaciers reached on the various stages of the development of glaciation.
冰碛物组成的终碛垅,代表了在冰川发育的不同阶段冰斗冰川下达的空间位置。
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