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Alfred Wegener - Proposed Continental Drift Theory in 1912. His theory was not accepted because he could not explain how the continents moved.

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Continental Drift | 100 Greatest Discoveries

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Groundbreaking research by Alfred Wegener reveals the phenomenon of continental drift. However, Wegener's research was largely ignored by his contemporaries. | For more, visit http://science.discovery.com/#mkcpgn=ytsci1 Subscribe to Science Channel! | http://www.youtube.com/subscription_center?add_user=sciencechannel Check out SCI2 for infinitely awesome science videos. Every day. | http://bit.ly/SCI2YT Download the TestTube app! | http://testu.be/1ndmmMq

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The layer of the Earth above the core and beneath the crust. The mantle is composed of solid rock but this rock tends to flow under heat and pressure. Convection occurs here.

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Two tectonic plates move towards each other and collide. Earthquakes, volcanoes, and mountain building, are common features at these types of boundaries.

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The theory that the Earth's lithosphere is broken into plates. Convection currents in the mantle are the driving force behind the movement of the plates.

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Theory proposed by Alfred Wegener in 1912. His theory stated that the all the continents were connected together in Earth's past as one supercontinent called Pangea. Over time, the continents broke apart and drifted to where they are today.

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Earth's source of heat. The inner core is solid while the outer core is liquid.