The UNESCO index uses ratio values of P/ETP to delineate four broad arid regions. semihumid zones(0.50 < P/ETP < 0.75) semi-arid zones(0.20 < P/ETP < 0.50)
Click here. Why did people make settlements near the Nile river? Rich green vegetation lines the fertile banks of Egypt’s Nile River, culminating in the.
