Extreme drought does strange things to soils. As the moisture disappears, they lose their adhesion. This is why the gigantic dust storm just occurred in Arizona. It’s so dry that the desert itself has ceased to be a tightly packed surface. This could also be the case in a Texas town, except for the fact that this place looks wet.

Story Source:
http://www.youtube.com/watch?v=ZEvCP7TXIEU
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