Erosion in America
Erosion of America's farmland by wind and water has been a problem since settlers first put the prairies
and grasslands under the plow in the nineteenth century. By the 1930s, more than 282 million acres of
farmland were damaged by erosion. After 40 years of conservation efforts, soil erosion has accelerated
due to new demands placed on the land by heavy crop production. In the years ahead, soil erosion and
the pollution problems causes are likely to replace petroleum scarcity as the nation's most critical
natural resource problem.
The author points out in the passage that erosion in America:
a) has damaged 282 million acres ever since settlers first put the prairies
and grasslands under the plow.
b) can become a more serious problem in the future.
c) has been so severe that it has forced people to abandon their
settlements.
d) occurs only in areas with no vegetation.
e) was on the decline before 1930s.
RESPOSTA: B
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