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Modern Sea-Floor Hydrothermal Systems: Some Basic Facts• 300 known sites of hydrothermal activity and related mineral deposits• 100 sites of high-temperature hydrothermal activity (black smokers)• 65% on mid-ocean ridges (55,000 km)• 22% in back-arc basin environments (22,000 km including arcs)• 12% on active submarine volcanic arcs•

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