Answer:
(a) The early 1930's were years of persistent drought. Rains failed year after year and temperatures soared. The wind blew with ferocious speed. (b) But ordinary dust storms became black blizzards because the entire land had been ploughed over and stripped of all its grass. (c) In the early 19th century, zealous farmers recklessly uprooted all vegetation and used tractors to break the sod into dust. Thus they turned the whole region into a dust bowl. (d) The settlers had thought they could conquer the entire landscape and turn the entire land into cultivated land that would give them profits the lesson to be learnt here is that the ecological conditions of each region has to be respected.
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