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A chemistry professor explains the science that makes salt a cheap and efficient way to lower freezing temperature. Skip to main content. 24/7 Help. For premium support please call: ...
The argument against the hypothesis is evidence of fluctuation in ice cover and melting during "snowball Earth" deposits. Evidence for such melting comes from evidence of glacial dropstones, [33] geochemical evidence of climate cyclicity, [49] and interbedded glacial and shallow marine sediments. [50]
The flood hypothesis hinges on the geomorphology of the Bosporus since the end of the glacial age. [20] The Black Sea area has been isolated and reconnected many times during the last 500,000 years. [21] Opponents of the deluge hypothesis point to clues that water was flowing out of the Black Sea basin as late as 15,000 years ago. [22]
The actual Zanclean flood theory however only arose during the 1970s, when it became clear that salt deposits and a widespread erosion surface in the Mediterranean had been emplaced during a prolonged sea level lowstand, and that the subsequent reflooding took place in only a few millennia or less. [67]
The Younger Dryas impact hypothesis (YDIH) proposes that the onset of the Younger Dryas (YD) cool period at the end of the Last Glacial Period, around 12,900 years ago was the result of some kind of cosmic event with specific details varying between publications. [1]: Sec 1 The hypothesis is widely rejected by relevant experts.
The presence of melt ponds is affected by the permeability of the sea ice (i.e. whether meltwater can drain) and the topography of the sea ice surface (i.e. the presence of natural basins for the melt ponds to form in). First year ice is flatter than multiyear ice due to the lack of dynamic ridging, so ponds tend to have greater area.
Melting ice is slowing Earth's spin and causing changes to its axis, new studies find. The shifts are causing feedback beneath the surface, impacting the planet's molten core.
Polar ice sheets are losing billions of tons of mass every year, and meltwater is responsible for about a third of the global average rise in sea level since 1993 Much remains a mystery about the ...