Out of the dust

AP - A dust storm approaches Stratford, Texas in this April 18, 1935 photo provided by the National Oceanic & Atmospheric Administration from the George E. Marsh Album. In the Dust Bowl days of the 1930s a single dust storm could linger for days. In a study published recently in Science magazine, Siegfried Schubert determined that slight changes in the surface temperatures of two oceans created atmospheric conditions that caused the Dust Bowl from 1931 to 1938. (AP Photo/NOAA George E. Marsh Album)