Some important evidence for continental drift came after Wegener's death. The amazing Himalaya Mountains are the result of this type of convergent plate boundary. There is only one logical explanation. because it is unlikely that the mesosaurus could swim between continents. c=] UKX4t,MMl:yD?n#G`37JiQcMW[[61C]TJaM5A7;t4Bi#KsxpQ1,Z7Id, B@s6uXr!N,MB=>ReJ:hFA (Le9>V0B=4merCVl [Y vax>+G Reaching as tall as 30 meters, the Glossopteris emerged during the early Permian period (299 million years ago) and became the dominant land plant species until the end of the Permian. Evidence | Alfred Wegener: Building a Case for If you have ever been hiking or camping, you may have used a compass to help you find your way. To test this, geologists fitted the continents together as Wegener had done. One of the most compelling lines of evidence in support of continental drift came from the fossil record. Tolstoy, I. The plate tectonic revolution had taken hold. WebThe continental drift hypothesis was developed in the early part of the 20 th century, mostly by Alfred Wegener. How do glaciers support the theory of plate tectonics? The statement that doesn't describe evidences as regards Continental Drift Hypothesis is : B: .Identical rock types found of continents separated by vast oceans. Summarize how rocks, fossils and climate provided evidence of continental drift. In their liquid state as magma or lava, the magnetic poles of the minerals align themselves with the Earths magnetic field. This would tell them where magnetic north was at the time the rocks cooled. 400-million-year-old magnetite in Europe pointed to a different north magnetic pole than the same-aged magnetite in North America. Wilson, J. T. A new class of faults and their bearing on continental drift. Plates Collide When two plates carrying continents collide, the continental crust buckles and rocks pile up, creating towering mountain ranges. Continental plates are formed due to cooling of magma. 26. Poorly respected in his lifetime, Wegener and his ideas about moving continents seemed destined to be lost in history as fringe science. If the continents havent moved, then this would suggest an ice sheet extended from the south pole to the equator at this time - which is unlikely as the UK at this time was also close to the equator and has extensive coal and limestone deposits. On the left: The apparent north pole for Europe and North America if the continents were always in their current locations. Before long, scientists proposed other models showing plates moving with respect to each other, with clear boundaries between them [25]. Continental drift is a theory that assumes all continents of the earth were a part of a single super-continent.The fossil evidence of Lystrosaurus supports the theory of continental drift.. Continental drift: It is a theory that assumes all continents of the earth were a part of a single super-continent that later move away from each other.. Explain how ancient glacial deposits in Africa, India, Australia and South America support the idea of centennial drift. How does glacial evidence support continental drift, Fossil specimens ofMesosaurus have only been found in two regions: southern Africa and South America. The Appalachians of the eastern United States and Canada, for example, are just like mountain ranges in eastern Greenland, Ireland, Great Britain, and Norway (figure 2). When plates drift away from each other, there is formation of new crust at divergent boundaries. If the continents had remained fixed while the north magnetic pole moved, there must have been two separate north poles. Besides the way the continents fit together, Wegener and his supporters collected a great deal of evidence for the continental drift hypothesis. Ewing, M., Ewing, J. I. Fossils of another reptile, Lystrosaurus, were found in Africa, India, and Antarctica. Some explained this as part of the normal movement of earth magnetic north pole. The findings suggest that sediment lubrication controls the rate at which Earths crust grinds and churns. The movement of these tectonic plates is likely caused by convection currents in the molten rock in Earths mantle below the crust. The two paths merge into one if the continents are allowed to drift. Identifying port numbers for ArcGIS Online Basemap? is it more likely a part of an end! In 1896, Henry Cabot Lodge warned, Your email address will not be published. The earths outer shell is composed of plates that move a little bit every year. Alfred Wegener in Greenland. Igneous rocks containing magnetic minerals like magnetite typically provide the most useful data. in. Possibly the most important fossil evidence found is the plant, Glossopteris. 16. The crystals record both the direction and strength of the magnetic field at the time. How does paleoclimate data support the idea of continental drift? Today glaciers only form on land and nearer the poles. How glacial deposits were used to prove the theory of plate tectonics? In the early part of the 20th century, scientists began to put together evidence that the continents could move around on Earths surface. Which of these features was formed by continental continental crust collisions? The entire region is known as a subduction zone. Answers for geologist, scientists, spacecraft operators. In other words, although the magnetite crystals were pointing to the magnetic north pole, the location of the pole seemed to wander. The continents fit together like pieces of a puzzle. & Ewing, M. North Atlantic hydrography and the Mid-Atlantic Ridge. Continental drift was a revolutionary theory explaining that continents shift position on Earths surface. Wegener also compiled evidence by comparing similar rocks, mountains, fossils, and glacial formations across oceans. With more time, researchers discovered these thinner sediment layers were located close to mid-ocean ridges, indicating the ridges were younger than the surrounding ocean floor. Plate tectonics is the theory that Earth's land masses are in constant motion. Ch 13 and 14 questions 7 .docx - Retention Questions Describe how magnetite indicates magnetic pole.
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