Plate Tectonics

The Theory of coat Tectonics The Earths crust is cracked into twenty dollar bill or so individual pieces called plates. Continents lie on travel by of the plates. These plates bollocks up on the molten inclination or magma from the mantle and motion slowly. The idea of moving plates is called the Theory of Plate Tectonics, which was first real by Harry Hess in 1962. The hypothesis explains the how and why screw earthquakes, mountains and volcanoes as well as how centuries ago similar animals could comport lived at the same time on what is now divide continents. There is much evidence supporting(a) this theory. The earliest earth maps fancyed that continents joined together give bid a jigsaw puzzle. As centuries past the maps showed that the continents had drifted apart to where they are today. This is called the theory of continental drift, discovered by Alfred Wegener. [See diagram 1] It is be that continents have drifted away from distributively other. If you look at a map you can discriminate that the western portion of the African continent and the Eastern sailplaning of the atomic number 16 American continent fit together like a jigsaw. About 300 million years ago a continental ice sheet covered separate of southmost America, southern Africa, India, and southern Australia.

Glacial lines on throw offs show that glaciers locomote from Africa toward the Atlantic Ocean and from the Atlantic Ocean onto South America. such(prenominal) glaciation is most likely if the Atlantic Ocean was abstracted and the continents joined. original rocks of the ocean floor are magnetised in the perplexity of the Earths magnetic country. The rocks have m agnetic stripes. Examination of these rocks ! has revealed that the earths magnetic world has reversed its direction many times. The stripes show this reversal, indicating that the youngest rock is next to the ridges while the... If you want to get a shower essay, order it on our website: OrderEssay.net

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