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
Answer: A
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Which of the following statements is true regarding HIV/AIDS in Africa?
A. The incidence of infection is higher in rural areas than in urban places. B. It is spread primarily by military personnel, migrant workers, and prostitutes. C. AIDS spreads quickly across the continent because mosquitoes carry it. D. Only Southeast Asia has more cases of HIV than Africa south of the Sahara.
Describe the differences between active and passive continental margins. Where is each type found?
What will be an ideal response?
What are the elements in the "A" columns of the period table called?
A) main group elements B) inner transition elements C) metalloids D) transition elements
Define a "primary key."
What will be an ideal response?