The soils characterized by plentiful partly decayed plant material are ________.
A) Histosols
B) Mollisols
C) Vertisols
D) Spodosols
E) Oxisols
Question 2
The productive wheat lands of parts of Washington, Oregon, and Idaho are underlain by soils incorporating volcanic ash and are classified as ________.
A) Andisols
B) Mollisols
C) Alfisols
D) Oxisols
E) Histosols