Most spillways below dams are designed to withstand the
A. 1,000-year flood.
B. 100,000-year flood.
C. 10,000-year flood.
D. 100-year flood.
Answer: A
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Indicate whether the statement is true or false
The crisis in controlling bedbugs has encountered difficulties because
A) bedbugs are vectors for serious human diseases and require powerful chemical pesticides. B) home applications of effective pesticides can endanger children. C) the only way to get any control is to burn infested bedding. D) bedbugs are internal parasites that require long doses of antibiotics to eliminate.
Why was the earthquake that struck Haiti in 2010 so much more deadly than the earthquake that struck Tohoku, Japan, in 2011?
A) The Tohoku earthquake struck a rural area, whereas the Haiti earthquake centered on the capital city. B) The Haiti earthquake was much more powerful than the Tohoku quake. C) Buildings in Japan are more rigidly built and less flexible than those in Haiti. D) The Haiti earthquake created a tsunami that killed tens of thousands of people. E) Japan has a stricter building code.
A well-sorted sediment contains particles that are of about the same size. Indicate whether the statement is true or false