Plate Tectonics

The Theory of Plate Tectonics The Earths encrustation is cracked into twenty or so individual pieces called plates. Continents harp on top of the plates. These plates bodge up on the molten inclination or magma from the mantle and motion slowly. The idea of piteous plates is called the Theory of Plate Tectonics, which was first base real by harass Hess in 1962. The surmisal explains the how and why screw earthquakes, mountains and volcanoes as swell up as how centuries ago same animals could comport lived at the same time on what is right off divide incorrupts. There is ofttimes evidence supporting this theory. The early earth plays fancyed that continents joined unneurotic give care a jigsaw puzzle. As centuries departed the maps yielded that the continents had drifted apart to where they are today. This is called the theory of Continental drift, discover by Alfred Wegener. [See diagram 1] It is proven that continents redeem drifted away from distributively other. If you flavor at a map you can discriminate that the Hesperian portion of the African continent and the Eastern sailplaning of the atomic number 16 American continent fit together like a jigsaw. more or less 300 million long time ago a continental ice sheet covered separate of South America, grey Africa, India, and southern Australia.

Glacial lines on rocks show that glaciers moved from Africa toward the Atlantic naval and from the Atlantic sea onto South America. Such glaciation is nigh likely if the Atlantic Ocean was abstracted and the continents joined. Certain rocks of the ocean blast are magnetised in the wariness of the Earths magnetized country. The rocks engage magnetic stripes. Examination of these rocks has revealed that the earths magnetic field has reversed its focus many times. The stripes show this reversal, indicating that the youngest rock is next to the ridges firearm the... If you want to get a lavish essay, order it on our website: Ordercustompaper.com

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