Did you know our oceans arrived from space? And that Saturn's moon, Titan, has a double-decker ocean?
Heather McElhatton talks to the authors of "Ocean Worlds" about their new book, detailing the vast history of not only our oceans here on Earth, but of oceans on other planets in our solar system as well.
Author Jan Zalasiewicz is a senior lecturer in geology at the University of Leicester and on the Council of the Geological Society of London. Co-author Mark Williams is a geology professor at the University of Leicester and on the Council of the Palaeontographical Society in London.