Answer:
(i)
They occurred because of the persistent droughts in that area.
(ii) The rains failed year after year and temperatures soared. The wind
blew with ferocious speed.
(iii) But ordinary dust storms became black blizzards only
because the entire landscape had been ploughed over and the grass was ruined
which could hold soil.
(iv) When wheat cultivation had expanded dramatically in
the early 19th century, zealous farmers had recklessly uprooted all
vegetation, and tractors had turned the soil over and broken the sod into dust.
The whole region had become a Dust Bowl.
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