Six sedimentary structures, ice split seams, ice slid marks, ice collapsed seams, ice induced pellets, ice eroded ripple marks and ice level marks, are newly found in Yellow River delta.

在黄河三角洲新识别出6种冰冻沉积构造：冰劈裂缝、冰成滑痕、冰塌裂缝、冰成球粒、冰蚀波痕和冰位痕。

youdao

That study used computers and current ice-level information to predict future ice levels.

VOA: special.2009.05.05

However, the fact that more ice rests below sea level means that on millennial timescales, increased amounts of ice are potentially vulnerable to ocean melting.

BBC: Antarctic ice volume measured

The time taken for the waves to complete this journey is recorded, and it is a fairly straightforward calculation to work out the height of the ice above sea level.

BBC: Arctic ice thickness 'plummets'

About 20 thousand years ago, during a colder phase in this ice age, sea level was up to 130 metres lower than at present.

BBC: Looking for the greenhouse signal