How Was Alfred Wegener’s Continental Drift Theory and the Supercontinent Pangaea Finally Proven?

Without the ultimate proof of the force behind continental drift, Alfred Wegener’s theory was rejected by most as a fairy tale. The first hint of proof came right after Wegener’s death, with the confirmation of the submerged mountain range called the Mid-Atlantic Ridge under the Atlantic Ocean and a central valley along its crest. Wegener probably would have concluded that this was evidence of the force he was looking for.

The mountain range indicated expansion from under the ocean floor, most likely caused by heat, and the valley indicated a stretching of the ocean floor. In the mid-1960s, scientists were able to study Earth’s crust more closely, especially the ocean floor, and discovered that Earth’s outer shell is made up of large, rigid plates that move. The concept is called plate tectonics.

We now know that continents and the ocean floor form plates that seem to float on the underlying rock. The underlying rock is under such tremendous heat and pressure that it behaves like a ... more.

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