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(near Alamosa, Colo., Nov. 13, 2007) Ripples form on the more rounded crests of certain dunes. Brian Metzler and John O'Connor go sandboarding in Great Sand Dunes National Park and Preserve, Colo., on Tuesday, Nov. 13, 2007. STEVE PETERSON

(near Alamosa, Colo., Nov. 13, 2007) Ripples form on the more rounded crests of certain dunes. Brian Metzler and John O'Connor go sandboarding in Great Sand Dunes National Park and Preserve, Colo., on Tuesday, Nov. 13, 2007. STEVE PETERSON