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Initial results from the MELT Experiment are shown in this schematic cross-section of the upper mantle beneath the East Pacific Rise. The melting region below the mid-ocean ridge extends over a broad area several hundred kilometers wide. The region is asymmetrical, with a wider zone west of the ridge than east of it. The melting region also extends far deeper than many scientists have previously theorized: to depths of 150 to 200 kilometers beneath the ridge, although the greatest concentration of melt occurs above 100 kilometers.[back]
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