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Continental drift
movement of Earth's continents relative to each other / From Wikipedia, the free encyclopedia
Continental drift is a historical, scientific theory. The theory was first proposed by Abraham Ortelius in 1596. It was fully developed by the German geologist and meteorologist Alfred Wegener in 1915.
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The theory said that parts of the Earth's crust move slowly on top of a liquid mantle of higher density. The theory has now been included in the wider theory of plate tectonics.