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, (1) 282 million acres of farmland (2) by erosion. After 40 years of (3) efforts, soil erosion has accelerated due to new demands (4) on the land by heavy crop pollution. In the years ahead, soil erosion and the pollution problems it causes are likely to replace petroleum scarcity as the nation's most critical (5) resource problem. 1. A. more than B. more C. less D. than 2. A. damaged B. was damaged C. were damaged D. damages 3. A. conserve B. conservation C. conserving D. conservations 4. A. were placed B. was placed C. which placed D. placed 5. A. nature B. natural C. nation D. national