In some places the rock floor beneath the ice is 8, 000 feet below sea level . 冰层覆盖下的岩层在有些地方为海面下八千英尺深。
Much of the northern lands were covered by vast ice sheets that reached a thickness of as much as 3 kilometers . 北方大陆的大部分地区曾为厚达3公里的大量冰层所覆盖。
This would start the formation of ice sheets such as those that several times have flowed south across north america and eurasia . 这样就会开始形成像那些曾几度往南流过北美和欧亚大陆的冰层。
And this shows the depth of the ice covering the ground 这显示了地上冰层的厚度
The ice will break up when the warm weather comes 天气转暖，冰层就会破裂。
Tyler : look . s lik . e the rebreather punched a hole through the ice 好像呼吸器把冰层撞穿了
The sun soon thawed the ice on the river 太阳很快融化了河上的冰层。
The southern ice sheet is over 2200 meters thick , on average 南部的冰层厚度平均超过2200米。
The team collected ice samples and data on temperatures 探险队员们采集了冰层样本和温度数据。
