A pair of tennis balls fall through the air from a tall building. One ball is ordinary and the other is filled with lead pellets. Air resistance just before they hit the ground is actually greater for the
A) regular ball.
B) lead-filled ball.
C) same for both
B
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Bottom-up control of primary productivity refers to control by all of the following except ________.
A. salinity B. grazing C. nutrients D. light E. temperature
The region between two adjacent isograds makes up a single metamorphic facies. Indicate whether the statement is true or false
Which of the following is not one of the limitations of the three models on the internal social structure of the city?
A) The models are too simple and fail to consider the variety of reasons that lead people to select particular residential locations. B) The three models are all based entirely on conditions in the United States. C) Critics question their relevance to contemporary urban patterns in the United States and in other countries. D) Models are simplifications, and we must remember that not everyone with the same characteristics will live in the same neighborhood. E) The models all assume that over time, cities will evolve to accommodate critical changes in demography and adapt to the growing needs of the urban poor.
Extremely fertile soils that have been formed out of volcanic material are
A. entisols. B. andisols. C. inceptisols. D. histosols.