Sandstone arches formed by gravity and stress, not erosion
Bryce Canyon, Utah (UPI) Jul 21, 2013 - Sandstone arches, alcoves and pillars are scattered across the globe, monuments to nature's strange beauty - odd, gravity-defying shapes carved by the wind and rain. Or so we thought. A new study suggests these spontaneous stone structures are not exactly carved by the whims of erosion. Although wind and water perform the grunt work - blowing abrasive sheets of sand and water droplets ... more

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