Which of the following is the largest contributor of urban outputs to outdoor air pollution?
A. burning fossil fuels
B. burning of leaves in yards
C. natural emissions of urban trees
D. outgassing of plastics
Answer: A
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Perihelion occurs during the Northern Hemisphere's winter
Indicate whether the statement is true or false
A common rock that can be dissolved easily by water and weak acids is
A) quartzite. B) quartz-rich sandstone. C) limestone. D) All of these are correct.
If the air temperature is the same as the frost point, then vapor pressure equals saturation vapor pressure
Indicate whether the statement is true or false
Judge the following sentence according to the criteria given below: A tidal bore is a true tidal wave BECAUSE it is a wave created by the tides
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.