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The theory of continental drift was fully proposed by Alfred Wegener in 1912. He noted that the eastern side of South America and the western side of Africa fit together, suggesting they were once joined. He also used fossils found on many different continents such as Lystrosaurus and Glossopteris to use as evidence.

But it wasn't until the 1940s until geologist Arthur Holmes fully explained. He said that in the mantle, convection currents moved the crust, and therefore the continents, around.

They move erratically because oceanic crust is created in certain places, which spreads and moves the plates. Subduction zones destroy this crust and further mess up movement. Styracosaurus Rider (Speak to the Rider, your Lord and Master) {Look upon my servants} 16:41, November 13, 2011 (UTC)