National Geographic : 1945 Jan
Our Global Ocean-Last and Vast Frontier 125 IIerford Tynes Cowling Salt from the Waters of the Gulf of Aden Goes to Season the Food of Africa Barges are loaded with salt by a continuous conveyor at Aden, in southwest Arabia, for export. The salt is obtained by evaporating sea water. Salt has been a staple commodity of trade since earliest times. Each 1,000 pounds of sea water contains on the average 27 pounds of salt dissolved in it (page 108). itoy walmo lliner Sunlight Filtering Down into a Submarine Coral Forest Gives a Ghostly Effect Brightly colored fishes dart in and out. Light bright enough for taking such photographs penetrates only a short distance into the ocean depths. Below 3,000 feet there is Stygian darkness.