small particles of rich soil
area built up by rich fertile soil left by river floods
chemical salt used to make fertilizer
illegal fishing or hunting
facility that turns petroleum into gasoline and other products
dry riverbed that fills with water when rare rains fall in a desert
large areas of soft sands and dunes in the Sahara
fertile area that rises in a desert wherever water is regularly available
agriculture that conserves water and uses crops and growing methods suited to semiarid environments
making a resource available in limited amounts
process of treating seawater to remove salts and minerals and make it drinkable
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