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Continental Drift and Menu Tectonics

 Continental Go and Plate Tectonics Composition

Continental Drift and Plate Tectonics Theory (Part 1a)

Intro: The Beginning of the " Ls Drift Theory” In the middle of the eighteenth hundred years, James Hutton proposed a theory, uniformitarianism; " this current is the key to the past”. It held that processes such as geologic forces- gradual and catastrophic-occurring in today's were a similar that operated in the past. (Matt Rosenberg, 2004) This theory coincides with all the theory of Continental Go that was first proposed simply by Abraham Ortelius in Dec 1596, who suggested that North, South usa, Africa and Eurasia were once linked but had been torn aside by earthquakes and massive amounts. He also discovered that the coasts from the eastern part of South America and the western coasts of Africa fit together like a jigsaw puzzle and this in shape becomes specifically prominent while the corners of the continental shelves possess similar styles and thus, is very much once fitted together. (Figure 1 . one particular and Number 1 . 2) The similarity of the southern area of continents' geological formations got led Roberto Mantovani to speculate that all prude had when been a supercontinent and was more compact in its volume level than it is currently. Through volcanic activity, cracks are created in the crust leading to this country to break a part. However , this kind of theory, known as the Expanding Earth Theory provides since proven incorrect. The idea of Continental Drift

In 1912, The idea of Continental Drift was intensively produced by Alfred Wegener, who said that the community was made from a single huge supercontinent known as Pangea considering that the Permian period, 250 mil years ago. This began building at the beginning of the Carboniferous period, 365 mil years ago, once Gondwana mixed into Laurussia producing the Appalachian huge batch belt in eastern The united states and shutting in Paleo-Tethys Ocean and modern landmass became exposed to air. Alexander Du Toit then suggested that 145-200 million years back, in the middle Jurassic Period, Pangea started breaking up into two smaller supercontinents, Laurasia in the northern hemisphere and Gondwana in the southern hemisphere, with Tethys Ocean and North Atlantic Sea separating the two supercontinents. The late Jurassic era started the formation from the Rocky Mountain range and Serrania Nevada mountain range. In the Cretaceous Period, sixty-five million years back, the two supercontinents then began fragmenting into the present eight continents. (USGS, 2012) The Tethys Sea that lay down between the two landmasses was subducted underneath Eurasia, creating the lower Atlantic Ocean. Ultimately, it vanished. (Nelson Thomas, 2007) (Figure 2) Wegener proposed that continents were moving around one lawn per 100 years and reinforced this theory with several points of facts.

Evidence assisting the Theory of Continental Go (Alfred Wegener and Ni Toit) Alfred Wegener harmonized coastlines, and he realized that by installing the ls shelves jointly, cratons shaped a contiguous pattern across the boundary of South America and Africa. (Lois Van Wagner, 2013) He realized that pile ranges that ended at one coastline seemed to begin again about another including ancient mountain range in S. africa that line-up with the mountains in near Buenos Zones in Argentina. (Sant, Paul, 2012) He discovered worms of the relatives Megascolecina, whom are less likely to be long migrators, had been found in soils of all the Gondwanaland continents. (kangarooistan, 2009) This kind of identical species could not have arisen on different prude without a lot of variations. (WiseGeek, 2010) Fossil remains of a prehistoric reptile known as the Mesosaurus had been revealed on both sides of the To the south Atlantic shorelines, yet the animal was struggling to swim throughout the Atlantic Ocean. (Lois Vehicle Wagner, 2013) Fossils of the land reptile, Lystrosaurus were discovered in South usa, Africa and Antarctica. (Sant, Joseph, 2012). He as well discovered the fossil herb Glossopteris was distributed during India, South America,...

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