 Complete the following phrase:  Douglas Mawson had accompanied Ernest Shackletons 190709 British Antarctic Expedition. Along with Edgeworth David and Alistair Mackay, he had been part of a man-hauled sledging expedition, the first to reach the area of the South Magnetic Pole. Upon his return from Antarctica, he recommenced to his post as geology lecturer at the University of Adelaide. Despite an offer from Robert Falcon Scott to join his 