“Hydrogen sulfide gas is emitted periodically along the Namibian coast. Ocean currents carry oxygen-poor water to the region, and chemical and biological processes can deplete what little oxygen is available. The sediments in the local seafloor are also rich with organic matter. When organic matter decays in an oxygen-poor environment, hydrogen sulfide emissions can result. Pale green patterns tinted the water along the Namibian coast. But these colors didn’t result from a phytoplankton bloom.”
(via Hydrogen Sulfide Emissions off of Africa : Natural Hazards)



