the forces will be a long time coming," he predicted in his last (1929) revision. With his multidisciplinary calling, Wegener had started out as an astronomer, being correct when he stated that craters on the Moon are the work of meteorites and not of volcanoes; later, he combined meteorological studies in Greenland with his geological theories, and did not have a steady job until after the age of 40, when an Austrian University created a post for him. A scientific idea that was initially ridiculed paved the way for the theory of plate tectonics, which explains how Earths continents move. Offsets of up to several hundred kilometres along oceanic ridges and, more rarely, trenches were also recognized, and these fracture zoneslater termed transform faultswere described as transverse features consisting of linear ridges and troughs. Resume of a Revolutionary Faraday, the Apprentice Who Popularized Electricity, Sustainability Notes n3: The Search for Alternatives to Fossil Fuels, Ventana al Conocimiento (Knowledge Window). He was a difficult scientist to pigeonhole. Direct link to DoctorMom2002's post How did his evidence help, Posted 4 years ago. time. And when Wegener finally understood that, he went on that expedition to see if he could make people see things his perspective. That clinched the argument for most geologists. what discovery provided strong support for continental drift theory answer choices geology fossil evidence electromagnetism paleomagnetism Question 5 30 seconds Q. which is NOT an evidence of seafloor spreading answer choices molten magma constantly erupting drilling samples of rock fossil evidence magnetic stripes Question 6 30 seconds Q. The fossils of these organisms are found on lands that are now far apart. Changes in the rocks magnetic field records, called magnetic anomalies, happen when Earths field reverses or when the northern and southern magnetic poles change places usually over hundreds of thousands of years. When molten lava is expelled from mid-ocean ridges, it cools, creating new ocean floor. The continents are blocks of thick crust that are passengers on the tops of large tectonic plates (lithosphere) that move over a softer part of Earths mantle (asthenosphere). But then playing Devil's Advocate, I stopped and thought about how important it is that we don't take every idea seriously like that. of his colleagues had simply ignored it. The fossil record shows that evolution from the ancient common ancestor to the modern horse How does the fossil record throw the theory of evolution into doubt. The concept of plate tectonics was formulated in the 1960s. He argued against the claim that earlier land bridges between the continents had sunk. Largely because of the efforts of American oceanographer Bruce C. Heezen, American geologist Henry W. Menard, and American oceanic cartographer Marie Tharp, ocean basins, which constitute more than two-thirds of Earths surface, became well enough known to permit serious geologic analysis. The idea of continental drift circulated in scientific circles until World War II, when sounding gear produced new evidence of what the seafloor looked like. In essence, plate-tectonic theory is elegantly simple. These components work together to limit vibration and keep your Land Rover up off the ground. Plate tectonics thus provides the big picture of geology; it explains how mountain ranges, earthquakes, volcanoes, shorelines, and other features tend to form where the moving plates interact along their boundaries. And scientists studying the seafloor with magnetometers found evidence of surprising magnetic variations near undersea ridges: alternating stripes of rock recorded a flip-flopping of Earths magnetic field.Together, these observations were consistent with a new theory proposed by researchers who built on Wegeners original idea of continental driftthe theory of plate tectonics. And also how Africa will merge with Europe, with the Mediterranean disappearing and a mountain range emerging in its place to compete with the Himalayasalthough Everest and its neighbouring mountains will still continue to rise. Lately, though, your rides been feeling a little bumpy. These plates move relative to each other, typically at rates of 5 to 10 cm (2 to 4 inches) per year, and interact along their boundaries, where they converge, diverge, or slip past one another. Hess proposed that the seafloor was spreading as magma erupted from Earths interior along the oceans mid-ocean ridges. The theory of plate tectonics is based on a broad synthesis of geologic and geophysical data. Wegener was attacked from virtually every possible vantage pointhis paleontological evidence attributed to land bridges, the similarity of strata (layers of rock) on both sides of the Atlantic called into question, and the fit of Atlantic shores declared inaccurate. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. Direct link to NineJinx's post it depends. easily by the scientific establishment. This map displays an early "supercontinent," Gondwana, which eventually moved to form the continents we know today. But the continents actually are shifting, very slowly, relative to one another. Direct link to kaylin.anderson's post by figuring out how to ex, Posted 5 years ago. Wegener considered such paleoclimatic validation one of the strongest proofs of his theory. That theory was initially ridiculed, but it paved the way for another theory called plate tectonics that scientists have now accepted to explain how Earths continents move.The story begins with Alfred Wegener (18801930), a German meteorologist and geophysicist who noticed something curious when he looked at a map of the world. That enabled Hess to understand his ocean floor profiles in the Pacific. Continental drift is the gradual shift in position of the earth tectonic plates ( i.e. One of the things that I love about the scientific community is not only how supportive it is, but how it forces you to explain how you know what you know and there's always at least one person trying to argue against your idea JUST to make sure that your idea actually isn't crazy or rooted in delusion. the ride was probably so smooth that you didnt even think about it! ", next: Vindication of a Visionary Direct link to kaylin.anderson's post how come alfred and ramus, Posted 7 years ago. Produced under a Cooperative Agreement for earth science education between the National Park Service's Geologic Resources Division and the American Geosciences Institute. This last observation is the Rosetta Stone for plate tectonic theory. The word 'fossil' was coined more than 500 years ago, by German scientist Georgius Agricola, though records describing fossils are much older. Please refer to the appropriate style manual or other sources if you have any questions. Finally, seismic waves slow down as they travel through a zone about 100 to 400 miles (150 to 700 kilometers) deep, a sign that there is a relatively soft layer within Earths mantle.
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