![]() ![]() The inner core switches between spinning just a little faster and a little slower than the surface, matching the surface’s speed roughly every 35 years, they write.īut not all scientists agree on the details of how the inner core is spinning, and some aren’t convinced that it’s spinning at all. The idea isn’t cause for alarm-the change is a normal part of a 70-year cycle, the scientists proposed Monday in Nature Geoscience. Now, the inner core lags slightly behind, they say. In a new study, researchers hypothesize that over the past decades, the pace of the inner core’s rotation has in turn gotten gradually slower, fallen into sync with the surface rotation and then slowed even further. Some say that deep beneath our feet, this innermost layer is spinning-and at a different speed from the rotation we experience on the surface. For decades, scientists have studied the behavior of Earth’s inner core, a solid iron ball at the heart of our planet that spans about 1,500 miles wide-nearly 70 percent of the moon’s size. ![]()
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