Which of the following set of circumstances has the greatest risk for debris flows?
a. rainfall for 8 hours with an intensity of 0.2 inches/hour in semiarid California
b. rainfall for 5 hours with an intensity of 0.7 inches/hour in Contra Costa County
c. rainfall for 10 hours with an intensity of 0.4 inches/hour in Marin County
d. rainfall for 12 hours with an intensity of 0.5 inches/hour in Contra Costa County
e. rainfall for 5 hours with an intensity of 0.7 inches/hour in Marin County
C
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Which of the following is an expression of the angle of repose?
A) Talus slope B) Some slopes of sand dunes C) Angle of slopes on cinder (scoria) cones D) All of these are correct.
In 1985, because of the Michoacan earthquake many buildings collapsed and killed about 8,000 people in Mexico City, even though the city lies 350 miles from the epicenter. All but which of the following caused this?
A. Soft lake-sediment foundations B. Improperly designed buildings C. Resonance between seismic waves D. Collapse of thousands of single-story frame houses
Which of the following is a disadvantage of clear-cutting?
A. low timber yield B. cannot reforest with fast-growing trees C. destroys and fragments wildlife habitats D. low profits in the short-term E. increases surface fires
In what climate(s) is solifluction prevalent?
A) Topics B) Tundra and subarctic C) Arid D) Temperate and humid