Plate Techtonics Essay Example | Topics and Well Written Essays - 500 words

Plate Techtonics - Essay Example According to this theory, the Earths crust is composed up of about a dozen plates or big rock slaps on which the continents and oceans lies. Plate tectonics explains the big scale movements of Earths lithosphere. The theory comprises the developed beliefs of continental drift, urbanized throughout the initial half of the 20th century, and seafloor scattering, understood during the 1960s Wiki (2008). The furthest part of the Earths center comprises two layers: top layer is the lithosphere which surrounds the coating and the inflexible topmost part of the layer. Inferior the lithosphere the asthenosphere lies. While the hard, the asthenosphere has comparatively small thickness and shear potency and is able to stream like a liquid on geological time scales. The inner deeper layer under the asthenosphere is extra rigid yet again due to the higher stress / pressure ThinkQuest(2008). The lithosphere is divided tectonic plates, if we talk about the Earth; there are 7 main and important plates and many small/ minor plates. These plates are frequently shifting their position because the surface under them, the boiling, hot, soft layer, is changing position gradually similar to a conveyor strap/ belt, determined by heat and other forces at work in the Earths core/ center. These plates or slaps are changing their positions or moving at speed of approximately a centimeter (0.5 inch) to 15 cm (6 inch) per year in diverse directions. In scientific notations this movement is called as â€Å"cross motion of the plates is naturally at rate of 50-100 mm/a† Wiki (2008). Now we talk about the Continental drift. It is the movement of or change in the position of the Earths continents compared to one another. The idea that continents drift was originally proposed by Abraham Ortelius in 1596 and was fully urbanized by Alfred Wegener in 1912. However it is fully developed after the advancement of the assumption of plate tectonics in the

History resoponse Essay Example | Topics and Well Written Essays - 1250 words

History resoponse - Essay Example Most people believed the idea that humans were capable of destroying themselves. This war as referred by some people was indeed a great war. It affected all the nations of the world, from Europe to Africa. Today its effects are still felt. It was mainly among Britain, Austria, United States, Germany, Russia and France. These nations mobilized masses in other countries to fight against their enemies. There was political reformation in the whole world. The war is believed to have been greatly fueled by religious differences. Most of the political reformation was on religious grounds. Serbia matched with Russia as they shared the same doctrines, Croatia joined forces with Austria. Bosnia supported the Ottoman Empire. The war was catalyzed when Germany declared its support for Austria against the Serbs. This angered Russia and awakened British and French. Treaties were formed and the result was Europe being divided into two blocs. France Britain and Russia came to fight against Germany, Italy and Austria. Diplomacy disappeared and it was all about war. The impact of the war was soon to leave a mark in history. The use of chemical weapons adversely affected the human race. Bombs and poisonous gases killed millions of people and the few who survived developed permanent health problems, both physical and mental. Families were shattered and weeping became the norm in the entire world since all nations were affected and its people were being killed. Some of the bombs had far reaching catastrophes as they affected future generations. Children would be born with various defects. The atomic gases affected lifespan of the human race. Those who had greatly inhaled the gases died at an early age. Freedom of speech and expression was lost. Soldiers could not freely give their opinions on various matters especially those that pertained to war. Civil societies lost their voice and they could demonstrate leave alone striking. This resulted to people living in fear