Which of these is LEAST important in determining the level of air pollution from a particular source?
A) height of stack used B) stability of the air layer
C) relative humidity at ground level D) prevailing wind speed and direction
C
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Which supercontinent contained Africa and South America?
What will be an ideal response?
Develop a plan for opening a single new coal mine in Australia for export. Where would you open the mine? What challenges would you face?
What will be an ideal response?
The primary factor which determines what type and how much radiation an object emits is its:
A) color. B) density. C) conductivity. D) temperature. E) size.
A deposit of volcanic tuff contains the isotope potassium-40, which is slowly decaying into argon-40. How might the apparent age of the sample be affected if the volcanic tuff is heated and remains heated for a long period of time?
A) The rate of decay will speed up. B) The sample will appear older than it really is. C) The sample will appear younger than it really is. D) Heat will have no effect on the age of the sample.