*snip* Their observations show that moving the rocks requires a - TopicsExpress



          

*snip* Their observations show that moving the rocks requires a rare combination of events. First, the playa fills with water, which must be deep enough to form floating ice during cold winter nights but shallow enough to expose the rocks. As nighttime temperatures plummet, the pond freezes to form thin sheets of windowpane ice, which must be thin enough to move freely but thick enough to maintain strength. On sunny days, the ice begins to melt and break up into large floating panels, which light winds drive across the playa, pushing rocks in front of them and leaving trails in the soft mud below the surface. *snip* Read more at: phys.org/news/2014-08-mystery-stones-death-valley-action.html#jCp
Posted on: Thu, 28 Aug 2014 14:40:59 +0000

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