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Seafloor crust, Marshall Islands

By Pacific Coastal and Marine Science Center
Cross-section of rock with distinct layers of sand grains at core then mostly black, each layer dated back millions of years.
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Detailed Description

Cross section of a seafloor crust (AKA, ferromanganese or cobalt-rich crusts) from the Marshall Islands collected at almost 2,000 meters depth. 

Sources/Usage

Public Domain.