The Vast Mystery of Cratons Is Solved!

The earth is always a-moving. “But certain parts of the continents called cratons-places in, for instance, Canada, South Africa, Australia-don’t recycle. They just sit there while their plates move around them, they’re a couple hundred kilometers deep, they’re like stable keels, and how they manage the stability has been a mystery. The answer turns out to be not terrifically sexy.”