Continental drift

Images Evidence The theory was supported by finding the same rocks and fossils in western Europe and the eastern North America. There are also similar fossils on the western coast of Africa and the eastern South America. The shapes of these continents nearly fits together.

Continental drift

In German meteorologist Alfred Wegener, impressed by the similarity of the geography of the Atlantic coastlines, explicitly presented the concept of continental drift.

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Though plate tectonics is by no means synonymous with continental drift, the term encompasses this idea and derives much… The idea of a large-scale displacement of continents has a long history.

Noting the apparent fit of the bulge of eastern South America into the bight of Africa, the German naturalist Alexander von Humboldt theorized about that the lands bordering the Atlantic Ocean had once been joined.

Some 50 years later, Antonio Snider-Pellegrinia French scientist, argued that the presence of identical fossil plants in both North American and European coal deposits could be explained if the two continents had formerly been connected, a relationship otherwise difficult to account for.

In Frank B. The first truly detailed and comprehensive theory of continental drift was proposed in by Alfred Wegenera German meteorologist. Bringing together a large mass of geologic and paleontological data, Wegener postulated that throughout most of geologic time there was only one continentwhich Continental drift called Pangea.

Late in Continental drift Triassic Period which lasted from approximately million to Westward drift of the Americas opened the Atlantic Ocean, and the Indian block drifted across the Equator to merge with Asia. In Alexander L. Laurasia in the north and Gondwana in the south. Aside from the congruency of continental shelf margins across the Atlantic, modern proponents of continental drift have amassed impressive geologic evidence to support their views.

Indications of widespread glaciation from to million years ago are evident in Antarcticasouthern South America, southern Africa, Indiaand Australia.

If these continents were once united around the south polar regionthis glaciation would become explicable as a unified sequence of events in time and space. Also, fitting the Americas with the continents across the Atlantic brings together similar kinds of rocks, fossils, and geologic structures.

A belt of ancient rocks along the Brazilian coast, for example, matches one in West Africa. Moreover, the earliest marine deposits along the Atlantic coastlines of either South America or Africa are Jurassic in age approximately RuncornPatrick M.

Blackettand others. Ferromagnetic minerals such as magnetite acquire a permanent magnetization when they crystallize as constituents of igneous rock.

Particles of magnetized minerals released from their parent igneous rocks by weathering may later realign themselves with the existing magnetic field at the time these particles are incorporated into sedimentary deposits. This could be explained either by the migration of the magnetic pole itself that is, polar wandering or by the migration of Europe relative to a fixed pole that is, continental drift.

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However, further work showed that the polar wandering curves are different for the various continents. The possibility that they might reflect true wander of the poles was discarded, because it implies separate wanderings of many magnetic poles over the same period.

Continental drift

However, these different paths are reconciled by joining the continents in the manner proposed by Wegener. Increased knowledge about the configuration of the ocean floor and the subsequent formulation of the concepts of seafloor spreading and plate tectonics provided further support for continental drift.

During the early s, the American geophysicist Harry H. Hess proposed that new oceanic crust is continually generated by igneous activity at the crests of oceanic ridges —submarine mountains that follow a sinuous course of about 65, km 40, miles along the bottom of the major ocean basins.

The ocean floor is thus pushed at right angles and in opposite directions away from the crests. By the late s, several American investigators, among them Jack E. Oliver and Bryan L. Isacks, had integrated this notion of seafloor spreading with that of drifting continents and formulated the basis of plate tectonic theory.

Oceanic ridges occur along some of the plate margins.

Continental Drift and Evolution

· This four-volume treatise on The Continental Drift Controversy is the first complete history of the origin, debate, and gradual acceptance of this revolutionary explanation of the structure and motion of the Earth’s outer Illuminates Wegener's continental drift hypothesis and his supporting evidence including the distribution of fossils, rocks, structures, and the climate Evidence of Continental Drift.

Wegener based his theory on 2 basic facts. First was the geological fit. Wegener noticed that the coastlines of all the continents seemed to fit together, like a jigsaw Ice Age: Continental Drift Full Movie Here you can stream and watch Ice Age: Continental Drift movie [] Animation genre, Comedy genre, Adventure genre, Family genre, released in Movie was produced in US under Ulrich Erfurth productionunder Mike Thurmeier productionunder Steve Martino productionunder Pedro Daniel López Continental drift is the movement of the Earth's continents relative to each other, thus appearing to "drift" across the ocean bed.

The speculation that continents might have 'drifted' was first put forward by Abraham Ortelius in The concept was independently and more fully developed by Alfred Wegener in , but his theory was rejected by some for lack of a mechanism, which was. Continental drift was a theory that explained how continents shift position on Earth's surface.

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