The Snowball Earth refers to a series of ice ages that happened between 725m and 541myears ago.
雪球事件指的是7.25亿-5.41年前一系列的冰川时代。
These were, at their maxima, among the most extensive glaciations in the Earths history.
在顶峰时期,它们是地球史上最大规模的冰川时期。
They alternated, though, with periods that make the modern tropics seem chilly: the planetsaverage temperature was sometimes as high as 50C.
不过他们是交替发生的,在某些时候,使得现在的热带地区变的寒冷,有时候全球的平均温度却高达50度。
Add the fact that a supercontinent was breaking up at this time, and you have a picture of aworld in chaos.
从而导致了一个超大陆分裂,从此我们就有了一个混乱的地球,
Just the sort of thing that might drive evolution.
就是这些事情可能导致进化的发生。
Dr Zhu and his colleagues hope to find out exactly how these environmental changescorrespond to changes in the fossil record.
朱博士和他的同事希望从化石记录的变化中发现这个时期环境是如何确切变化的。
The animals carnival
动物狂欢节
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