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
The Sense of the Past The Sense of the Past The Sense of the Past is an unfinished novel by the American author Henry James that was published in 1917, a year after James' death. The novel is at once an eerie account of time travel and a bittersweet comedy of manners. A young American trades places with a remote ancestor in early 19th century England, and encounters many complications in his new surroundings. Young Ralph Pendrel of New York City has written a fine essay on the reading of history. The essay so impresses a distant English relative that he bequeaths an 18th-century London