How rocks can move across the flat ground of a dry lake bed in Death Valley

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"I'm amazed by the irony of it all." http://bbc.in/1wOEp0g

Scientists have finally solved the mystery of how rocks can move across the flat ground of a dry lake bed in Death Valley, California.

Researchers say the large and heavy rocks are propelled along by thin, clear sheets of ice on breezy, sunny days.

BBC | 29 August 2014