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Since "Wet" rock melts at a lower temperature than "dry" rock, this helps initiate partial melting in subduction zones. The subducting material is saturated with sea water which helps speed up the melting process. Steam rises into the overlying lithosphere and asthenosphere and causes the formation of vast quantities of magma

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Q: Describe how the presence of ocean water in crustal rocks might affect the formation of magma?
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