The most mobile dunes are:a
longitudinal.
b. transverse.
c. barchan.
d. parabolic.
e. none of the above
C
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Monoculture, the practice of planting large areas with a single crop ________
A) requires no artificial pesticides or fertilizers B) is typical of Native American farming techniques C) is a development of industrial agriculture D) always uses no-till techniques of planting E) accounts for less than 1% of U.S. farmland
Which of the following heavy metals is/are associated with damage to the human nervous system?
A) radon B) lead C) mercury D) mercury, lead, and radon E) mercury and lead
Which of these force fields can increase a moving electron's speed?
A. Electric field. B. Magnetic field. C. both of these D. none of the above
In the United States, the first phase of urbanization is migration ____.
A. from rural areas to large central cities B. from large central cities to smaller cities and suburbs C. forced by economic issues from West to East D. from North and East to South and West E. from cities and suburbs to developed areas outside suburbs