The Next SupercontinentAn internationally recognised scientist shows that Earth's separate continents, once together in Pangea, are again on a collision course. You've heard of Pangea, the single landmass that broke apart some 175 million years ago to give us our current continents, but what about its predecessors, Rodinia or Columbia? These "supercontinents" from Earth's past provide evidence that land repeatedly joins and separates. While scientists debate what that next