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 supercontinent will look like—and what to name it—they all agree: one is coming.
In this engaging work, geophysicist Ross Mitchell invites listeners to remote (and sometimes treacherous) lands for evidence of past supercontinents, delves into the phenomena that will birth the next, and presents the case for the future supercontinent of Amasia, defined by the merging of North America and Asia. Introducing listeners to plate tectonic theory through fieldwork adventures and accessible scientific descriptions, Mitchell considers flows deep in the Earth's mantle to explain Amasia's future formation and shows how this developing theory can illuminate other planetary mysteries. He then poses the inevitable question: how can humanity survive the intervening 200 million years necessary to see Amasia?
An expert on the supercontinent cycle, Mitchell offers listeners a front-row seat to a slow-motion mystery and an ongoing scientific debate.
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Les Johnson is a NASA physicist and author. By day, he serves as the senior technical assistant for the Advanced Concepts Office at the NASA George C. Marshall Space Flight Center in Huntsville, Alabama. In the early 2000s, he was NASA’s manager for interstellar propulsion research and later managed the In-Space Propulsion Technology Project. He is the author of Rescue Mode, coauthored with Ben Bova, as well as Back to the Moon and On to the Asteroid, both coauthored with Travis S. Taylor.