The primary rainbow is produced by raindrops falling below a cloud; the secondary bow is produced by frozen precipitation
Indicate whether the statement is true or false
False
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Complete the following nuclear equation: Tl ? Pb +?
A) e B) He C) gamma ray D) both A and B E) none of the above
The abundant formation of hydroxyl radicals in the atmosphere
A) removes many common pollutants from the stratosphere. B) removes many common pollutants from the troposphere. C) promotes the formation of ozone that protects against damaging ultraviolet light. D) promotes the formation of nitrous oxides that in turn lower levels of carbon dioxide.
Limestone is dominated by the mineral ________
A) quartz B) calcite C) gypsum D) hematite
On what basis was the name aromatic originally given to compounds?
A) They had strong odors. B) Their first application was in aromatherapy. C) Their odors were considered to be pleasant. D) Their odors were considered to be unpleasant.