Asphalt, here shown solidified into a seafloor pavement with bulbous features left over from its extrusion, forms a hardground that hosts corals in the Dive 9 area.

Asphalt, here shown solidified into a seafloor pavement with bulbous features left over from its extrusion, forms a hardground that hosts corals in the Dive 09 area.. Image courtesy of the NOAA Office of Ocean Exploration and Research, Gulf of Mexico 2017.

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