Soils are an important resource for all the following reasons except
A. they are a source of aluminum.
B. they are a renewable resource.
C. they are the essential medium for growing food.
D. they are a source for building materials.
Answer: B
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All of the following are conducive to the formation of tornadoes EXCEPT
A. mountains and other topographic barriers. B. internal rotation and updrafts. C. vertical wind shear. D. tightening internal rotation.
What planktonic group accounts for 80% of all photosynthesis in the tropics?
a. Picoplankton b. Nanoplankton c. Microplankton d. Mesoplankton
Time-space convergence is defined as
A) the reduction in the cost of travel and travel time among places. B) friction of distance. C) distance decay. D) the reduction in the travel costs between places as a result of transport improvements. E) none of the above
A 1000-kg car and a 2000-kg car are hoisted the same distance in a gas station. Raising the more massive car requires
A) less work. B) as much work. C) twice as much work. D) four times as much work. E) more than four times as much work.