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Pink sky tonight, Sailor's delite - Does that still count in the desert?

Here's a weird idea. We know that air becomes denser if filled with suspended particles. So might a "dust storm" simply be some dense air rolling down a slight incline? If true, the storm might keep itself going by stirring up more dirt, which creates more wind as it then flows downhill. Like a river, it picks up silt and then deposits it again downstream. But unlike a river, the silt itself is the mass driving the downhill flow.

In other words, are some dust storms really a kind of landslide?