How an Astronomer advanced the Continental Drift Theory

Why are there oceans and why are there continents?  Between 1906 and 1908 Alfred Wegener went on an expedition to the high arctic, doing experiments which had never been done before while trying his best to survive at the same time. As unlikely as it sounds he became the scientist (and he wasn't even a geologist) behind the theory of continental drift. Flora Lichtman and Sharon Shattuck have the story.