Dust Devils

A dust devil is a rotating updraft that forms when hot air near the ground rises quickly through a small pocket of cooler, low-pressure air above it, picking up dust and debris as it spins. Formed most often over flat, barren terrain, dust devils are typically less than 3 ft (0.9 m) wide, reach maximum wind speeds of 45 mph (72 km/h), and dissipate in less than a minute. Though usually harmless, some are strong enough to pose a real danger. On what other planet have dust devils been observed? Discuss
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