According to a new study, the Earth's inner core appears to have stopped spinning, and is changing its direction every 60 to 70 years or so.
published in the journal, support the theory that the core comes to a halt and reverses direction every 60 to 70 years.
"The mantle and inner core are both highly heterogeneous, so the gravity between their structures tends to drag the inner core to the position of gravitational equilibrium, so-called gravitational coupling," lead authors Yi Yang and Xiaodong Song, a pair of researchers at Peking University, told"If the two forces are not balanced out, the inner core will accelerate or decelerate," they explained.
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