Earth Once Swallowed Its Own Superocean. Could It Happen Again?

By Stephanie Pappas The ancient supercontinent of Rodinia turned inside out as the Earth swallowed its own ocean some 700 million years ago, new research suggests. Rodinia was a supercontinent that preceded the more famous Pangea, which existed between 320 million and 170 million years ago. In a new study, scientists led by Zheng-Xiang Li of …