Recent U.S. legislation has mandated increased use of biofuels, and the number of ethanol refineries is growing rapidly. It is now predicted that by 2015, as much as ________% of the U.S. corn crop could go toward ethanol production.
A. 50%
B. 70%
C. 25%
D. 100%
Answer: A. 50%
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Stress is the force applied per unit area which the force acts. Which of the following forces are stresses?
a. Rotation stress b. Compressional stress c. Tensional stress d. Shear stress e. Both b, c, and d
Following the urban heat island profile from rural areas to a typical downtown urban area, which of the following is TRUE?
A) Large urban parks do not mitigate against the urban heat island. B) Commercial and urban residential areas have the highest late afternoon temperatures. C) On average, urban areas are 1 to 3°C higher than nearby rural areas. D) The temperature variations between urban and rural environments are negligible.
In a temperate latitude, estuary ________.
A. evaporation exceeds precipitation B. precipitation exceeds evaporation C. tides only control the estuary circulation D. precipitation equals evaporation E. winds and tides control the estuary circulation
Stream terraces along the sides of river valleys are usually evidence of _____
a. mass wasting b. trellis drainage c. distributary channels d. changes in base level or tectonic movements e. wind action