Answer:
A sinkhole lake forms by The formation begins with the subsurface dissolution of limestone, ultimately leading to surface collapse. As sediments are washed into the depression, the sinkhole becomes plugged.
With the recent technologies and scientific innovations we have now on studying and providing detailed analyses of the polar ice cores, it is roughly estimated that we could profile the ancient climate the Earth had in a time period as early as 800,000 years in order to explain the most recent climate change.
Because the higher you will go this colder it will get or depending which mountain you are aiming for just like Mount Everest.
I believe that the answer is Urea.
