"We believe the inner core rotates, relative to the Earth's surface, back and forth, like a swing," they told AFP. "One cycle of the swing is about seven decades," meaning it changes direction ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. In elementary school science class, we learned that the Earth has ...

According to the scientists, the inner core rotates faster than the Earth's surface for about half ... To you, it will look like the spot "reversed direction" even though it's still rotating ...

According to the scientists, the inner core rotates faster than the Earth's surface for about half the cycle ... To you, it will look like the spot "reversed direction" even though it's still rotating ...