When a light source recedes, it shows
A. no shift at all.
B. a red shift.
C. a blue shift.
D. none of the above
Answer: B
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Which of the following would have most likely prevented the deadly 1948 smog in Donora, PA?
A) The shift of industrial production from the day to evening hours B) The addition of scrubbers to the smokestacks used by the Donora industries in order to remove effluents C) Increased use of coal to generate electricity and heat homes in the region D) Use of high sulfur instead of low sulfur coal to generate electricity and heat homes
Given that the total number of atoms on our planet remains fairly constant, how is it ever possible to deplete a natural resource such as a metal?
A. The atoms don't leave our planet, which is why naturally occurring materials never really reach the point of depletion. B. The problem is with the expense of collecting metal atoms that are uniformly dispersed. C. The problem remains that not everyone recycles as they should. D. Recycling only forestalls the inevitable depletion of metal resources.
Approximately what percentage of precipitation that falls on the continents runs off the surface via rivers/streams?
A) One-tenth B) One-third C) Two-thirds D) Nine-tenths
An ENSO will deliver warm equatorial waters to the western Pacific around Christmastime.?
Indicate whether the statement is true or false