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BIOLOGICAL IMPORTANCE OF WATER
SALT WATER AND THE SEA
10 other sections not shown
acid Africa agriculture Algeria alluvium annual aqueduct aquifer artesian average basin borehole built calcium calcium carbonate canal carbonate cause century chloride climate connate water consumption contains countries crops cultivated depth desert drilled drink drosometer eaux effluents electric erosion evaporation evapotranspiration fish floods flow fluorescein foggaras forest fossil water France fresh water g/litre gall gall./sec geological greensand groundwater hectares horizon humid hydrogen hydrogeologist impermeable increase industry infiltration irrigation lakes land limestone litres m/sec method miles million gall million hectares million kWh million sq mineral Niger Nile North organic output Paris period permeable piezometric pints plant pollution population problem produced pumped rain rainfall region reservoir river rocks runoff Sahara salt sand sea-water semi-arid silt sodium sodium chloride soil sources springs station streams sulphate supply surface tanks temperature tion tons Touggourt town transpiration Tunisia underground valley vegetation Wadi yield