What is the statistical recurrence interval for a flood of rank 2 in a data set that is 99 years long?
a. on average, once every 10 years
b. on average, once every 20 years
c. on average, once every 30 years
d. on average, once every 40 years
e. on average, once every 50 years
E
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How did the National Academy of Scientists rate most U.S reactors in terms of vulnerability to terrorist attacks in 2005?
A. highly vulnerable B. no risk C. low vulnerability D. well prepared for any sort of attack
The above map graphically represents
A) U.S. students studying abroad. B) U.S. expatriate destinations. C) refugees from the U.S. D) contraceptives provided by the U.S. Agency for International Development. E) medical personnel sent to help fight epidemics and zoonoses.
How big was the meteorite that apparently caused the Cretaceous-Tertiary mass extinction?
A) 1 km B) 10 km C) 100 km D) 1000 km