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Through a series of chemical reactions the ice has created oxygen.
冰通过一系列化学反应制造氧气。
While the planet was frozen,
地球结冰时，
the Sun's ultraviolet rays reacted with water
太阳紫外线与冰里的水分子起作用
molecules in the ice, to produce hydrogen peroxide, a chemical rich in oxygen.
制造富含氧的化学物质－－过氧化氢
Now, as the ice melts, the hydrogen peroxide breaks down and releases massive amounts of oxygen.
此时冰融化，过氧化氢分解并释放大量的氧。
The Earth is waking up,
地球渐渐醒来，
and it's a very different place.
它变得截然不同。
600 million years ago, the atmosphere is warmer, like a summer day.
6亿年前的大气比较暖和，感觉像夏天，
And the days are about 22 hours long.
而且一天大约持续22小时，
Add all this water and it's the perfect recipe for life.
加上这些水，就成了创造生命的完美环境。
Before Snowball Earth, primitive bacteria emerged in the oceans.
雪球地球期前，海里已有原始细菌，
But surely they couldn't have survived an ice age 75 times longer than the entire span of human history.
但它们绝不可能熬过比人类历史长了75倍的冰河期。
