Essay on the development and record of plate tectonics

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Essay on the development and record of plate tectonics

Plate tectonics emanates from two phrases plate and tectonic. Plate in geological terms means a considerable slab of challenging rock even though tectonics in Greek impliesa�� to builda��. Thereforea�� plate tectonic might be outlined as how the eartha��s is created on shifting the plate. It can even be well-defined as a rigid segment on the Earth’s lithosphere that moves independently from individuals bordering it (Rodger, 1993). Concept of plate tectonics states which the lithosphere from the earth is built up of unique plates which have been fragmented into a number of massive and compact items of solid rock. The plates go up coming to one another in addition to the reduce mantle to create varied varieties of plate borders that have formed the Earth’s landscape about lots of a long time.(Oreskes & Legrand, 2001). Alfred Wegener, a popular meteorologist, is known to be the founder with the plate tectonic idea; He noticed that the coastline of East South America and that of west coast of Africa seemed to fit together in a jigsaw manner like to form a bigger plate. He then proposed an idea that all plates (continents) were connected to a single huge plate called Pangaea which gradually began to drift apart above 300 million decades ago (Rodger, 1993). More scientific research to the platesa�� coastline revealed that all the plate of eartha��s continent somehow fit together. The principle was commonly known as continental drift idea, and Wegener became the founder of the principle on which scientist have based their research on. However, Alfred Wegener plate tectonics concept could online Buy cheap reglan and www.bestessaysforsale.net Purchase order betapace vs betapace Cheap Buy not ascertain how exactly the continents drifted away from each individual other. He proposed the eartha��s rotations and the centrifugal forces towards the equator as the mechanism for continental drift. He said that Pangaea started at South Pole and eartha��s rotation finally caused it to break up, sending continents toward the equator. His theories were discarded by the scientific community (Rodger, 1993). Arthur Holmes, (1929), a British geologist, came up with the concept of thermal convection to explain the gradual drift with the Earth’s continents. He based on heating and cooling cycle on the Earth’s mantle that caused the continents to go. The idea has been borrowed by scientist community in their quest for eartha��s shape. Today scientist have researched and analyzed past evidences and findings by geologist and scientist to expound and come up with a better ways of explaining plate tectonic idea and forces that were behind the drifting of the plates. It is believed and proofed using geological evidence that eartha��s plate at one time was one super plate called Pangaea. Due to three main driving forces namely, mantle convection, gravity, and the Earth’s rotation led to the drifting away of many plate from the main one. Various major plates (continents) were formed which include North America, South America, Eurasia, Africa, Indo-Australian, Pacific, and Antarctica. Expounding to the three main driving forces for the movement of the Earth’s tectonic plates; Mantle convection is the most extensively studied technique of tectonic plate movement. It was widely discussed by Holmes in 1929, in his theory. The big convection current of molten material in the Eartha��s upper mantle produces a lot of energies which is transferred to decrease mantle. The lower mantle material finds their way to the crust causing the embedded rock to move out and away from the ridge thus moving the plate. Evidence of this is shown at mid-ocean ridges. Gravity is evidenced by the mid-ocean ridges where the elevation is higher than the encompassing ocean floor. Convection currents within the Earth cause lower mantle material to rise and spread away from the ridge, causing the older material to flow toward the ocean floor due to gravity and aid in the movement of the plates. Then lastly earth rotation is caused by centrifugal forces as earth rotates (Oreskes $ Legrand, 2001). Plates form different types of boundary as they interact with their movement. Some from the boundaries formed include Divergent boundaries form when a plate breaks along certain lines of weakness and go away from every other forming a new crust, for instance, Mid-ocean ridges. The other boundary is called Convergent boundaries and is created when two plates collide with one another causing the sinking of one plate below the other. Transform boundaries forms at location where new crust created and without destroying it. Today, through research, scientists have come up with several evidences proving that earth plates were once super plate which split into the current Continents. Some of the evidences include: the jig-saw fitting in the East coast of South America and west coast of Africa appear to fit into one another; Fossils remains of plants and animals collected by scientist around the world showed similarities that were tough to explain unless continents had once been joined. For instance, Cynognathus was a land reptile. Its Fossils remains have been found in both Africa and South America, thus proving which the two continents were once joined (Oreskes $ Legrand., 2001). Scientist have also found out from the evidence of earthquakes happened continually and occurred along certain lines, near the boundaries between tectonic plates. As Wegener’s ideas forms the basis why the landscape of your earth is the way it is, scientist community currently advanced methodology of studying the plate tectonic idea. They use satellite to study evidences of plate tectonic where they position it numerous kilometers away from the earth surface. From the satellite statistics, it is evidenced which the plates move linearly and away from each individual other at the speed of 10mm to 100mm per year.

References Oreskes, N., & LeGrand, H. E. (2001). Plate tectonics: An insider’s record on the modern theory with the Earth. Boulder, Colo: Westview Press. Rogers, J. J. buy panmycin by upjohn cost of norvasc W. (1993). A record from the earth. New York, NY, USA: Cambridge University Press.

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