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Bubblin’ plume

Sonar survey spies mysterious, 1.4-kilometer-tall feature in the depths off California

An oceanographic survey has discovered a 1,400-meter-tall plume rising from the seafloor off the coast of California. Water samples taken at the site, about 32 kilometers northwest of Cape Mendocino, indicate that the feature isn’t mineral-rich water spewing from a hydrothermal vent, but researchers aren’t yet sure exactly what the feature is made of.

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