Soil conservation on farms is best implemented by which of the following methods?
A. terracing, contour farming, and alley cropping
B. contour farming, plowing, and cover crops
C. alley cropping, cover crops, and plowing
D. plowing, tilling, and contour farming
E. cover crops, alley cropping, and tilling
Answer: A
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Recent increases in carbon dioxide levels are plotted on a graph called the _______________
Indicate whether this statement is true or false.