Ten thousand years ago, the area of Glacier National Park was covered by ice up to one mile below sea level.

一万年以前，国家冰川公园低于海平面的地区被厚达一英里的冰层覆盖。

youdao

Today, the 20-mile-wide Mertz Glacier is one of Antarctica's great ice streams, draining the ice from this part of East Antarctica.

现在，20英里宽的默茨冰川是南极的大型冰流之一，将冰从南极东部不断泄出。

youdao

Greenland's Petermann Glacier, shown in 2009, lost about one-quarter of its 43-mile-long floating ice-shelf on Aug. 5, satellite imagery shows.

格陵兰的彼得曼冰川，摄于2009年。8月5日，卫星图像显示大约43英里长的浮动冰架约有4分之一已经脱落。

youdao

About 14 million years ago, a period of climate change caused the formation of the Antarctic ice sheet, which averages one mile in thickness and gets up to three miles thick in some parts.

BBC: How Antarctica works