Why are lahars so dangerous?
A) They are the hottest of all lava flows.
B) They contain deadly chemicals.
C) Hot pyroclastic fragments melt ice and snow; this mixture flows extremely fast.
D) They are the most explosive of all volcanic eruptions.
Answer: C
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Which of the following emits more radiation?
A. a computer monitor B. a nuclear power plant C. a television set D. fallout from nuclear tests in the '50s and '60s E. a coal-fired power plant
A secondary rainbow requires
A) a single reflection within a raindrop. B) two reflections within a raindrop. C) three reflections within a raindrop. D) no reflection within a raindrop.
What type(s) of intermediates is/are generated during the acid-catalyzed hydration of an alkene?
A) an oxonium ion B) a carbocation C) both a and b D) neither a nor b
Precipitation and evaporation are two components of ________
A) the lithosphere B) Earth's energy budget C) the heterosphere D) the cycle of sublimation E) the hydrologic cycle