11.   The volunteers, whose idea of civic service includes trudging through shifting beach sand in hot, heavy boots, do not boast.

12.   There was early evidence that Reaganomics, as it came to be called, was set upon shifting sands.

13.   Any skeletal remains would have been eaten by creatures on the sea floor, unless they were quickly buried by shifting sand.

14.   The once bustling Silk Road stop was buried by shifting sand, which preserved temples, houses and even food and seeds stored in jars.