raveling
 n.— «In some places, air pockets between the soil, rocks and other debris have created a crumbling effect, a process called “dry raveling” that could have played a role in the weekend death of a teenage hiker.» —“Unstable soil needs time for new growth to take root” by Jennifer Bowles Press-Enterprise (Riverside, California) Jan. 14, 2004. (source: Double-Tongued Dictionary)

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