What is down hill to a continent?
SCIENCE NEWS of the MONTH
Continents Have Stopped Sliding Down Hill
• THE migration of continents, which some geologists think a continual process, while others deny it, is suggested by George W. Munro, of Purdue University, in a letter to Science, to have been an actual occurrence; but one which has happened only twice in two billions years of the earth’s history, when sufficient heat was developed near the surface to start continental masses moving under pressure. He suggests that the American continent hit a snag, which broke its backbone.