In a transect across the 98th meridian (across the great plains) from west to east, which of the following gives the correct sequence of soil orders?
A. Alfisols, Aridisols, Ultisols
B. Aridisols, Oxisols, Mollisols
C. Aridisols, Spodosols, Ultisols
D. Aridisols, Mollisols, Alfisols
E. Alfisols, Mollisols, Aridisols
Answer: D. Aridisols, Mollisols, Alfisols
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