Land that can be used or is suitable for growing crops

process of removing salt from seawater for drinking water or irrigation of crops

the process in which a desert spreads

shortage of rain that is harmful to humans and farming

fertile area that rises in a desert wherever water is available

groups that move from place to place looking for a supply of food for them and their herds

resources that can be easily replaced

resources that cannot be easily replaced

semi-arid region between the desert and the arable land

of the utmost importance; extremely important

the act of eating or drinking something

a very small supply

very bad, serious, or unpleasant

to supply something with water by using artificial means (such as pipes)

exhausted of richness or fertility; to use up the strength or richness of

capable of producing desired results without wasting materials, time, or energy

to become worse or to make (something) worse or more severe