Rocks of ages

• Autores: Ralph D. Lorenz
• Localización: New scientist, ISSN 0262-4079, Nº. 2984, 2014, págs. 39-41
• Idioma: inglés
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• Resumen

  • Death Valley National Park is an awesome, dramatic place and Racetrack Playa is no exception. The dry lake bed sits 1100 meters above sea level at the end of a 40-kilometer rocky road that climbs up among the Joshua trees. Despite Death Valley's reputation as one of the hottest and driest places on the planet, it does rain and the playa does flood from time to time. Evidently, the boulders must have moved when the playa was wet and soft. Here, Lorenz resolves a century-old puzzle on what makes boulders glide across the desert in Death Valley.