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
Rebecca (given name) Rebecca (given name) Rebecca or Rebekah (Hebrew: רִבְקָה ("Rivkah")) is a feminine given name originating from the Hebrew language. The name comes from the verb רבק ("rbq"), meaning "to tie firmly"; Jones' Dictionary of Old Testament Proper Names and the NOBS Study Bible Name List suggest the name means "snare", "noose", "tied up", "secured", and even "beautifully ensnaring". W. F. Albright held that it meant "soil, earth". Rebecca was the wife of Isaac and the mother of Jacob and Esau in the Hebrew Bible. The Latin Vulgate uses the spelling Rebecca exclusively and it is followed by ("ex. gr.") Wycliffe