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The observed direction of polar motion, shown as a light blue line, compared with the sum (pink line) of the influence of Greenland ice loss (blue), postglacial rebound (yellow) and deep mantle convection (red). The contribution of mantle convection is highly uncertain. Credits: NASA/JPL-Caltech

Scientists identified three reasons responsible for Earth’s spin axis drift

When Earth rotates on its spin axis - an imaginary line that goes through the North and South Poles - it drifts and wobbles....