Millions of years ago, the American Southwest sat next to East Antarctica
What a juxtaposition: About 800 million years ago, East
Antarctica, now one of the coldest regions on Earth, abutted what is now
Both locales were part of an equatorial supercontinent
called Rodinia, says John Goodge, a geologist at the
The motion of tectonic plates continually rearranges Earth’s continents, sometimes cramming most or all of them into immense groupings called supercontinents.