How the earth spin: inside and outside

Via I fucking love science

The Earth’s inner core is made up of solid iron and currently superrotates in an eastward direction, while the outer core, made of mainly molten iron spins westward and at a slower rate. This is the first time scientists have been able to link the way the inner core spins to the behaviour of the outer core. Earth’s magnetic field pushes eastwards on the inner core, which causes it to spin faster than the Earth, but it also pushes in the opposite direction in the liquid outer core, which creates a westward motion.

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Image: Andrzej Wojcicki/Corbis


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