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A rock sample dredged from the Mid-Atlantic Ridge shows how seawater flowing between subsurface rocks alters them and cements them together. The rocks' outer rims (gray) have been chemically changed by interaction with hot seawater and can be easily distinguished from the relatively unaltered interior (brown). By comparing the geochemistry of the rim and the interior, researchers can determine the ways in which elements are exchanged between seawater and rock[back]
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