In hazy conditions, distant objects are usually more visible in the afternoon than in the morning, even when the concentration of particles in the air has not changed
a. True
b. False
ANSWER: True
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A device that transforms electrical energy to mechanical energy is a
A) generator. B) motor. C) transformer. D) magnet. E) none of the above
Chemicals in which of the following groups are not considered organic chemicals?
A) enzymes B) minerals C) proteins D) vitamins
During the history of the earth there have been periods when all the continents were together in a supercontinent
Indicate whether the statement is true or false
Which of the following is not a factor scientists attribute to climate change and water resource issues of the Colorado River basin?
A) reduced mountain snowpack B) expansion of the subtropical dry zone C) higher evaporation rates D) summer shift of the ITCZ to the American Southwest E) early spring snow melts