南极洲半岛靠往南美洲的南极洲的地块,是近年地球快速升温的地方之一,并出现大冰原(ice sheets)的冰层崩裂。不过一直由厚冰层复盖的南极洲的整体气温看似没有变化。
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例如,随着覆盖北美的大冰原在最后一个冰河时代逐渐融化,大量的水从冰原流出。
For example, as the great ice sheets that covered North America during the last ice age steadily melted away, huge volumes of water flowed from them.
但是,一个大冰原的融化就不同了。
上新世大约结束于三百万年前发生在北半球大冰原之间的碰撞。
The Pliocene ended around three million years ago with the onset of large ice sheets in the Northern Hemisphere.
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