22. the accuracy of estimates of bulk tonnage is further subject to considerable uncertainty about the physical properties of the sulphide mounds and chimneys.
318. scientists have recently discovered a field of hydrothermal vents with "chimneys " of carbonate and silica, potentially a new source of marine minerals.
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some of its ecosystems, such as the mangrove swamps, coral reefs and marine pasturelands in the coastal zone, or the hydrothermal chimneys and cold seeps in the marine zone, are extremely rich biologically.
(b) regularly review and update the boiler systems and the fuel stations at camp faouar in order to prevent contamination of the soil or the air (smoke through chimneys);