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National Geographic : 1974 Oct
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ALLSKYLAB3 NEW ENERGY SOURCES beckon in an image derived from a thermal infrared picture of The Geysers region of northern California (directly above). Believed to be "hot spots," a few degrees warmer than their surroundings, the areas could betray the presence of sub terranean steam. A utility company now taps one such source, discovered years ago. The hot spots show up as white in thermal IR (above middle) but not in other wavelengths (top). Erosion's turbid trail clouds Louisi ana's Gulf Coast (right). More than 133 million tons of silt a year flow to the gulf from the Atchafalaya River. Most of the silt originates in the Red and Mississippi Rivers, whose waters are partly diverted into the Atchafalaya for flood control. 486
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