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Quizlet the theory of plate tectonics
The impact of the continental drift
Essay on continental drift
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Unexplained Movement
The land we know to be certain continents, today, may not have existed in their current positions long ago. As technology has advanced in oceanography, it has been learned that there are many activities below the surfaced of the land and oceans, which can contribute to changes in, land mass. Those changes include wave erosion, volcanic activity, and lithospheric pressures. Plate tectonics was developed through a theory once named continental drift.
In developing plate tectonics, continental drift helped form hypothesis of a shifting landmass and sea floor. In 1850, scientist with the US Navy Dept. of Charts and Instruments discovered the Mid-Atlantic Ridge, while attempting to make a map of the sea floor (Salem 1999). Technology of the time didn’t extend into an ability to measure the depth or features of the ridge. During the mid 1900’s, additional sea floor surveys found the Mid-Atlantic Ridge had a valley, which showed to seismically correlate with many earthquakes (Salem 1999). These findings supported the claim of movement of landmass. Furthermore, findings lent themselves to the possibility of new sea floor created from the aftermath of seismic activity since valleys were found along the ridge, rather than canyons.
Wegener’s Theory
Continental Drift was a far-fetched theory when German scientist Alfred Wegener first proposed it in 1915. At the time, many geologists were convinced “that the continents and ocean basins had fixed geographic positions.” (Lutgens Tarbuck 2014). Wegener was a meteorologist by profession, not a geologist. He studied the atmosphere and weather patterns (Hoffman 2012) and went on scientific expeditions to measure temperatures or factors contributing to his studies. His experien...
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...h along the boundaries of each major ridge along the sea floor has also helped develop plate tectonic theories. These theories better explain why some boundaries of land diverge versus converging or transforming and the impacts to the land and sea floor. As satellite technology advances to measure movement of the various areas, civilizations can prepare themselves for changes in climate and living conditions.
References
Salem, P. (1999). Hess Identifies Seafloor Spreading as the Cause of Continental Drift. In , Great Scientific Achievements (p. 718). US: Salem Press.
Conniff, R. (2012). When the Earth Moved. Smithsonian, 43(3), 36-38
Hoffman, P. F. (2012). The Tooth of Time: Alfred Wegener. Geoscience Canada, 39(3), 102-111.
Lutgens, F.K. and Tarbuck, E.J. (2014). Foundations of Earth Science. 7th ed. Upper Saddle River, NJ: Pearson Education, Inc.
A significant portion of New England was formed as a result of an accretionary orogen. Southeastern New England is marked by a series of terranes that accreted onto the Laurentian supercontinent during the Silurian and Devonian. The Terranes of Gander, Nashoba, Avalon, and Meguma are present from west to east in eastern Massachusetts and all of are Gondwanan provenance. Their modern-day juxtaposition suggests that the marginal Gondwanan micro-continents collided sequentially from west to east, expanding the Laurentian continent with each respective collision. As each subsequent plate collided, an intervening subduction zone died and a new subduction zone was created to the east. The oblique collision of the Avalon Terrane into Laurentia followed the accretions of the Gander and Nashoba Terranes and preceded the accretion of Meguma. The collision was marked by uplift, mylonitic metamorphism, and calc-alkaline Nashoba plutonism as the Iapetus Ocean subducted under the Nashoba and eventually the Avalon collided obliquely into the continental margin.
could be used to explain and illustrate that previous theories were not entirely correct (Merali and Skinner, 2009, p.253). Through the analyzation of arrival times of these waves, Oldham had drawn an conclusion that p waves and s waves react differently in terms of being refracted, reflected or absorbed depending on the state of the material as shown in Figure 1.(Tarbuck, Lutgens, Tasa, 2013, p.143). Oldham had developed this theory of the Earth not being the same state due to these effects of seismic discontinuity which are shown in Figure 1., consisting of refraction, reflection and absorption. The changes that are displayed from this idea are; the speed of the waves due to a refraction occu...
analysis on how the Atlantic became known as the Atlantic because of the presence of
Source 4. A map of the Earth’s fault lines and plates with the direction of their movement.
Figure 6 - How longshore drift works (Brief). Source: Classwork image (originally from Google images)
Bibliography Wikipedia. The World of the. Gould, Stephen. Jay. Charles Lyell, Principles of Geology.
About 20 million years ago the last part of the Farallon sea floor plate subducted under the North American plate. This put the North American plate and the Pacific plate into contact, but unlike the Farallon sea floor plate, the Pacific plate sheared against the side of the North American plate. Because there was no plate subducting, the North American plate was in direct contact with the mantle (Tierney, 29). Heat from the mantle made the continental crust more ductile, which allowed the crust to extend and thin.
What have they learned since the quake quite allot. The fault moved in a fashion that geologists of
The theory of plate tectonics, only recently introduced to the world, transforms the thought that the earth has been the same since its beginning. The theory alters the view of the average person almost in the way that Columbus showed the world was round. The theory of plate tectonics was developed from the theories of continental drift and sea-floor spreading and states that the earth’s surface is divided into several large plates, which are constantly in motion.
Plate tectonics is the manner of which the Earth’s lithosphere moves around. The weakness of the Earth’s upper mantle allows the Earth’s lithosphere to move. The lithosphere is not a single unit, it is broken down into a series of plates. The result of plate tectonics movements result in large catastrophes and natural disasters.
839-841). Hoboken, NJ: Wiley & Co., Inc. Kerzner, H. (2013). The 'Path of the Earth'. Journal of Science, 63(3), pp. 113-117.
Why do the continents move everyday? what is causing them to is caused by glaciers falling into the ocean for example rockford was caused by a huge glacier that’s why there are lots and lots of fossils at rockford, because the glaciers carried the fossils to rockford. the evidence of glaciers forming would be ice sheets and ice chunks were found on land and in the ocean, and it affects the earth because it’s putting more water into the oceans. plate tectonics also may have caused the glaciers to fall into the ocean when the plates move which causes the the glaciers to fall. Plate tectonics is the theory that earth’s outer core shell is divided into several plates, there are three different they are Convergent,Divergent, and Transform they all
Earth System Science | Contributing to a fundamental scientific understanding of the Earth as a coupled system, through research and teaching. "The Silk Road." Accessed March 14, 2014. http://www.ess.uci.edu/~oliver/silk.html.
the the change in sea level is due to a change in the level of land
Plate tectonics is the theory that landmasses on tectonic plates are in slow constant movement due to convection currents in the mantle. Plate tectonics, or the movements of plates above the lithosphere (the most upper layer of earth's crust) can cause divergent, convergent,and transform boundaries.A boundary the way two tectonic plates collide. is Continental plates are plates that the continents are formed on. Oceanic plates are plates that the ocean covers, and the oceans form on top of these plates. Convergent boundaries and divergent boundaries are ways that these oceanic and continental plates interact with each other. Landforms are formed at boundaries. The landforms formed at boundaries depends on the type of plates that collide, and