In the Northern Hemisphere, tornadoes are most frequent during the ________
A) October-December period B) month of September
C) January-March period D) April-June period
D
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The albedo of Earth's surface is only about 4%, yet the combined albedo of Earth and its atmosphere is about 30%. Which set of conditions below best explains why this is so?
A) high albedo of clouds; low albedo of water B) high albedo of clouds; high albedo of water C) low albedo of clouds; low albedo of water D) low albedo of clouds; high albedo of water
In 2007, heavy rains accompanied an outbreak of cholera in children living in war-torn Iraq. What was the likely cause of the spread of this disease?
A) Pollution by raw sewage in waterways B) Outbreaks of mosquito-borne disease C) Lack of protection from the rain, causing the children to be very cold D) High levels of petroleum products in drinking water
Which of the following hydroxyaldehydes can be converted to a hydroxyketone through tautomerism?
A) 2-hydroxybutanal B) 3-hydroxybutanal C) both a and b D) neither a nor b
Demographically speaking, the effects of AIDS are most significant because ________
A) AIDS sickens and kills the youngest and most productive members of society B) AIDS strikes affluent people more than poor people C) AIDS leaves behind orphans D) it is caused by a virus E) it is not known who is resistant to AIDS