Water samples brought up from the depths are analyzed in sophisticated shipboard labs. Here, water gathered near the Atlantic Ocean’s Cape Verde Islands is removed from bottles. http://blogs.ei.columbia.edu/2012/07/09/investigating-the-world%E2%80%99s-oceans-pole-to-pole-and-deep-below-the-bottom/
Water samples brought up from the depths are analyzed in sophisticated shipboard labs
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