Scientists Solve Mystery of Earth's Shifting Poles

Did you know that Earth's solid exterior can move around over its core, causing the planet's poles to wander back and forth? Adam Maloof, associate professor of geosciences at Princeton University, discusses the consequences of these shifts, and what may be causing them.

Source: http://www.npr.org/2012/11/09/164797147/scientists-solve-mystery-of-earths-shifting-poles?ft=1&f=1007

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