At which of the following times is the lowest temperature usually observed?
A. several hours before sunrise
B. near sunset
C. several hours before sunset
D. near sunrise
Answer: D
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Which of the following is true about global warming?
A. The hottest years on record occurred during the Little Ice Age. B. Climatic zones are shifting from the poles toward the equator. C. Nine out of ten of the hottest years on record have occurred since 2000. D. Overall, there is still a balance in the number of hot and cold years.
A steep pressure gradient indicates strong winds
Indicate whether the statement is true or false
Given the compounds 1,1-diethyl-4-methylcyclohexane, and 4-ethyl-1,1-dimethylcyclohexane, which of the following statements is true?
A) Only 1,1-diethyl-4-methylcyclohexane is chiral. B) Only 4-ethyl-1,1-dimethylcyclohexane is chiral. C) Both are chiral. D) Neither is chiral.
A typical raindrop is slightly larger than a typical cloud droplet. Indicate whether the statement is true or false