A DROP of liquid heavier than water ... This is a very slowly whirling vortex ring. As it proceeds, the radius of the ring is augmented, and it begins to disintegrate into several minor vortex ...
The polar vortex sits in the stratosphere, which starts at around 6–20 kilometers (4–12 miles) above the planet's surface and reaches roughly 50 kilometers (around 31 miles) above.
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