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These magnificent swirling clouds are the result of a meteorological phenomenon known as the Karman vortex, a repeating pattern of spinning vortices caused by the unsteady separation of flow over bluff bodies. They appeared over AlexanderSelkirk Island in the southern Pacific Ocean – off the coast of Chile – rising voluptuously from the surrounding waters and creating a stunning spiral effect.
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and check out the rest of the
30 Best Landsat 7 images here. Each is worthy of IotD IMHO.