Anyone who has flown over the western United States knows the patterns well: Seemingly endless repetitions of similar landforms, ridges and valleys and ridges and valleys arranged with nearly the regularity of the teeth on a comb. Now, an MIT geologist and co-workers say they have found the underlying mechanism that explains these widespread patterns - and how they vary from one place to another. The fundamental understanding of the processes that lead to these parallel grooves. (source: web.mit.edu)
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