Although radiometric dating of ice cores has been difficult uranium has been used to date the dome c ice core from antarctica dust is present in ice cores and it contains uranium.
The west antarctic ice sheet is in places over 2000 m thick with the geological floor well below sea level the marine basins are variable with both rough mountainous terrain and flat deep oceanic basins2 with a maximum depth of 2555 m below present sea level.
Antarctica the deepest ice and therefore the ice with the longest record is found in antarctica as the ice in antarctica is mostly over land as opposed to the arctic where most of the ice is floating on sea this makes it ideal for deep core sampling.
The name antarctica is the romanised version of the greek compound word ἀνταρκτική antarktik233 feminine of ἀνταρκτικός antarktik243s meaning opposite to the arctic opposite to the north aristotle wrote in his book meteorology about an antarctic region in c 350 bc marinus of tyre reportedly used the name in his unpreserved world map from the 2nd century ad.
Wintertime antarctic sea ice is increasing at a small rate and with substantial yeartoyear variation monthly sea ice data show trends of increasing sea ice extent that are slightly above the mean yeartoyear variability over the satellite record 1979 to present.