What percent of sewage is treated in North America?
A. 25%
B. 90%
C. 75%
D. 50%
Answer: B
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The layer of quartzite in this photograph would mostly weather by
A) dissolution.
B) hydrolysis.
C) physical weathering.
D) spontaneous combustion.
Describe the two sources responsible for mercury exposure in humans.
What will be an ideal response?
All of the following could enhance a single-celled thunderstorm EXCEPT
A. extensive areas of cloud mergers between adjacent clouds. B. hot surface and an updraft dominated cloud. C. vertical wind shear keeping precipitation separated from the uplift zone. D. cool surface and a downdraft dominated cloud.
Why do humid tropical regions have only small variations in temperature throughout the year?
A) The canopy of trees in the rain forest shade the ground and reflect light all the time. B) The cloud cover and rain do not allow the temperatures to rise or fall significantly. C) The winds associated with these systems rapidly redistribute the heat. D) The location of this climatic region is limited to an area where the solar radiation does not vary significantly. E) The constant humidity maintains a relatively uniform temperature.