The continental drift hypothesis was developed in the early on part of the 20th century, mainly by Alfred Wegener. Wegener sassist that continents move around on Earth’s surface and also that they were as soon as joined together as a solitary supercontinent. While Wegener was alive, researchers did not believe that the continents might move.
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THE CONTINENTAL DRIFT IDEA
Find a map of the continents and also cut each one out. Better yet, use a map where the edges of the continents present the continental shelf. That’s the true size and also shape of a continent. Can you fit the pieces together? The easiest attach is between the eastern Americas and also western Africa and also Europe, however the rest have the right to fit together also (figure 1).
Take a look at this computer animation mirroring that Earth’s climate belts remajor in roughly the very same place while the continents relocate and this animation showing exactly how the continents break-up up.
Although Wegener’s proof was sound, many nlinux.orglogists at the time rejected his hypothesis of continental drift. Why perform you think they did not accept continental drift?
Scientists argued that tbelow was no method to define just how solid continents might plow with solid oceanic crust. Wegener’s principle was almost forgained till technological developments presented even even more evidence that the continents moved and also offered researchers the tools to build a device for Wegener’s drifting continents.
MAGNETIC POLARITY EVIDENCE
Puzzling brand-new evidence came in the 1950s from researches on the Earth’s magnetic history (figure 4). Scientists provided magnetometers, gadgets qualified of measuring the magnetic field intensity, to look at the magnetic properties of rocks in many kind of areas.
In various other words, although the magnetite crystals were pointing to the magnetic north pole, the place of the pole appeared to wander. Scientists were amazed to uncover that the north magnetic pole adjusted area via time (figure 6).
To test this, nlinux.orglogists fitted the continents together as Wegener had done. It worked! Tright here has actually just been one magnetic north pole and the continents have actually drifted (number 7). They called the phenomenon of the magnetic pole that seemed to relocate but actually did not noticeable polar wander.