An overview of the plate tectonics theory by alfred wegener

All these new findings raised important and intriguing questions. Driving forces related to mantle dynamics Main article: Initially, during the first half of the twentieth century, the latter phenomenon was explained by introducing what was called "polar wander" see apparent polar wanderi.

Wegener attributed this to the movement of the poles followed the approximate path of the movement of his continents. Convection currents This hypothesis suggests that flow in the mantle is induced by convection currents which drag and move the lithospheric plates above the astenosphere.

Plate tectonics

The deviations in the alignment of these paleomagnetic particles from the current direction of the Earth's magnetic filed shows that the continents have moved. The event was a paradigm shift and scientific revolution. Wegener could not explain the force that drove continental drift, and his vindication did not come until after his death in For example, the African Plate includes the continent and parts of the floor of the Atlantic and Indian Oceans.

As explained above, tectonic plates may include continental crust or oceanic crust, and most plates contain both.

Alfred Wegener (1880-1930)

This idea received very little attention at the time. This finding, though unexpected, was not entirely surprising because it was known that basalt—the iron-rich, volcanic rock making up the ocean floor—contains a strongly magnetic mineral magnetite and can locally distort compass readings.

Other cool stuff you should know 1. In this hypothesis the shifting of the continents can be simply explained by a large increase in size of the Earth since its formation. This theory was launched by Arthur Holmes and some forerunners in the s [15] and was immediately recognized as the solution for the acceptance of the theory as originally discussed in the papers of Alfred Wegener in the early years of the century.

Alfred Wegener

Translated from the fourth revised German edition by John Biram. Petermanns Geographische Mitteilungen in German. This force is regarded as a secondary force and is often referred to as " ridge push ". The heavy elements sunk to the core while the lighter elements floated to the surface and cooled to form the crust.

The vectors show direction and magnitude of motion. Only four years after the maps with the "zebra pattern" of magnetic stripes were published, the link between sea floor spreading and these patterns was correctly placed, independently by Lawrence Morleyand by Fred Vine and Drummond Matthewsin[53] now called the Vine-Matthews-Morley hypothesis.

Lately, the convection theory has been much debated, as modern techniques based on 3D seismic tomography still fail to recognize these predicted large scale convection cells. These boundaries are discussed in further detail below.

Apr 08,  · The Amoeba People present "The Posthumous Triumph of Alfred Wegener", the sad but true story of a scientist and his hypothesis. Continental drift was a theory that explained how continents shift position on Earth's surface.

Plate tectonics

Set forth in by Alfred Wegener, a geophysicist and meteorologist, continental drift also. In line with other previous and contemporaneous proposals, in the meteorologist Alfred Wegener amply described what he called continental drift, expanded in his book The Origin of Continents and Oceans and the scientific debate started that would end up fifty years later in the theory of plate tectonics.

Wegener's drift hypothesis also provided an alternate explanation for the formation of mountains (orogenesis). The theory being discussed during his time was the "Contraction theory" which suggested that the planet was once a molten ball and in the process of cooling the surface cracked and folded up.

Plate Tectonics and the Scientific Method Plate tectonics was originally called the “Theory of Continental Drift” originated by Alfred Wegener.

Continental drift was a theory that explained how continents shift position on Earth's surface. Set forth in by Alfred Wegener, a geophysicist and meteorologist, continental drift also.

Alfred Wegener An overview of the plate tectonics theory by alfred wegener
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