Is it possible that the wobble of earth's axis is the cause of climate change?
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- A typical desk globe is designed to be a geometric sphere and to rotate smoothly when you spin it.
- Our actual planet is far less perfect -- in both shape and in rotation.
- Earth is not a perfect sphere. When it rotates on its spin axis
- -- an imaginary line that passes through the North and South Poles
- -- it drifts and wobbles.
- These spin-axis movements are scientifically referred to as "polar motion.
- " Measurements for the 20th century show that the spin axis drifted about 4 inches (10 centimeters) per year.
- Over the course of a century, that becomes more than 11 yards (10 meters).
- Using observational and model-based data spanning the entire 20th century,
- NASA scientists have for the first time identified three broadly-categorized processes responsible for this drift
- -- contemporary mass loss primarily in Greenland, glacial rebound, and mantle convection.
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