Harry Hess was a scientist who first theorized key details about the earth's crust that revolutionized the understanding of plate tectonics. Plate tectonics is the separation of the earth's crust along fault lines. More »

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President Harry S. Truman's middle initial 'S' is itself his middle name; the initial does not stand for anything. Apparently, Truman's parents were torn over whether to give their son a middle name in tribute to his mat... More »

Harry Houdini died of peritonitis caused by a ruptured appendix. There is speculation that his death was caused by a McGill University student who punched him in the abdomen to test Houdini's strength. However, this is u... More »

According to About.com, the Earth creates mountains through plate tectonics, where its crust is broken into plates constantly in motion, causing stress and uplifting in order to grow mountains. While growth is slow due t... More »

Earth is unique in that scientists have found the planet to be the only one to have liquid water on its surface, intelligent life forms living on it, a moon that helps regulate surface temperatures, an atmosphere with 21... More »

Physical geography focuses on natural processes of the earth, including climate and plate tectonics, whereas human geography studies the effect and behavior of humans and how they relate to the physical world. The two fi... More »

Very slow currents in the relatively plastic lower mantle, or aesthenosphere, are thought to push the crustal plates along and drive the process of plate tectonics. These currents are caused by convection, with the mantl... More »

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