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Science Fair Necessities for Project ..
Although scientists differ on the extent of the ice, there is fairly widespread acceptance of the presence of glaciers at sea level at the equator, though some researchers prefer the term Slushball Earth. Many researchers have hypothesized the occurrence of two snowball events: the Sturtian (lasting from about 710 million to 670 million years ago) and the Marinoan (concluding about 635 million years ago.
Science Fair Necessities for Project ;
One of the most important ways in which the rock record supports evolutionary theory is the succession of fossils in older versus newer rock layers. As far back as the 18th century, scholars realized that fossils in older layers differed more from modern life forms than fossils in newer layers. While many fossils from the Pleistocene Ice Age resemble organisms living today, far fewer fossils from the Age of Reptiles do. If you venture back in the rock record to the Precambrian (prior to roughly 550 million years ago), you'll find few fossils of multicellular organisms at all, though you will find some. So striking has this fossil succession been that when asked what would disprove evolution, 20th-century British scientist J.B.S. Haldane quipped, "Fossil rabbits in the Precambrian." No such bunnies have ever been found.