https://scitechdaily.com/mighty-little-volcanoes-unveiling-the-deepest-hydrothermal-activity/
Researchers reveal the hydrothermal activity of "petit-spot" volcanoes using samples obtained from 5.7km (3.5 miles) underwater—the deepest known to date. Underwater volcanism on the Earth's crust are active contributors of many different elements to the ocea…
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