The continental drift hypothesis was occurred in the early part of the 20th century, mostly by Alfred Wegener. Wegener claimed that continent move approximately on Earth’s surface and also that lock were once joined with each other as a single supercontinent. If Wegener to be alive, researchers did not think 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 wherein the edges of the continents display the continent shelf. That’s the true size and also shape that a continent. Can you fit the piece together? The easiest attach is between the eastern Americas and western Africa and also Europe, but the rest can fit with each other too (figure 1).
Take a look at this computer animation showing the Earth’s climate belts remain in about the same place while the continent move and this animation showing how the continents split up.
Although Wegener’s evidence was sound, many historicsweetsballroom.comlogists at the time rejected his theory of continental drift. Why carry out you think they did not accept continental drift?
Scientists suggested that there was no method to explain how solid continents could plow v solid oceanic crust. Wegener’s idea was virtually forgotten until technical advances gift even much more evidence the the continent moved and also gave researchers the devices to develop 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 background (figure 4). Scientists supplied magnetometers, devices capable of measure the magnetic field intensity, come look in ~ the magnetic properties of rocks in numerous locations.
In various other words, return the magnetite crystals were pointing come the magnetic north pole, the place of the pole seemed to wander. Researchers were amazed to find that the north magnetic pole adjusted location v time (figure 6).
To check this, historicsweetsballroom.comlogists fitted the continents together as Wegener had actually done. The worked! There has actually only to be one magnetic phibìc pole and the continents have actually drifted (figure 7). They called the phenomenon the the magnetic pole that appeared to move but actually did no apparent polar wander.