Question

soil erosion in Americas farmland by wind and water has been a problem since first settlers put prairies and grasslands under the plow in the 19th century.
find an expression which describes farming from the above​

Answer 1

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. ... After 40 years of conservation efforts, soil erosion has accelerated due to new demands placed on the land by heavy crop production.