Out of curiosity, where did you find that Greenland has a "much greater surface area than Australia"? According to Google, Australia has a surface area of 2,970,000 square miles, whereas Greenland has a surface area of 836,300 square miles...so, Greenland is roughly 3 times smaller than Australia! If you were basing your sizes from a map, make sure you look into the problems with the Mercator projection map that we all know/use all the time! ;-)