The Lost Worlds of Planet Earth Ortelius hypothesized the idea that land masses may have been connected in the past, Alfred Wegener who hypothesized the idea of a super-continent Pangaea and continental drift despite the prevailing idea of flooded land-bridges at the time, and Bruce C. Heezen and Marie Tharp who discovered the Mid-Atlantic Ridge that supported the theory of plate tectonics. Tyson describes how the landmasses of the earth lay atop the mantle, which moves due to the motion and heat of the earth's outer and inner core. Tyson moves on to explain the asteroid impact that initiated the Cretaceous–Paleogene extinction event, leaving small mammals
Journey to the Past second single. The song was nominated for both an Academy Award and Golden Globe Award for Best Original Song in 1998. Aaliyah performed her rendition of "Journey to the Past" live at the 70th Academy Awards, becoming the youngest entertainer to perform at the ceremony. Actress Alexandra Shipp covered the song for the film "", a biographical film based on the singer's life; "Journey to the Past" was one of only four songs the producers were able to obtain the rights to use in the film since Aaliyah's family refused to license the majority of the singer's music to them.