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what is desertification, a steppe, a polder, a fjord, and wadi
What is the process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture, a large area of flat grassland in southeastern Europe, a long, narrow, deep inlet of the sea between high cliffs, as in Norway and Iceland, typically formed by submergence of a glaciated valley, and a valley, ravine, or channel that is dry except in the rainy season.