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.
Answer: B
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Which of the following areas provides a good regional source for an air mass?
A. mountain areas with deep valleys and strong surface winds B. generally flat areas of uniform composition with light surface winds C. mountain areas with deep valleys and light surface winds D. generally flat areas of uniform composition with strong surface winds
A half-life is the amount of time required ____
a. to lose half the daughter isotopes b. for the mass of the sample to decrease by one-half c. for half of the parent atoms to decay to daughter atoms d. for the parent atoms to increase by one-half e. to accurately date a rock sample
How much more solar radiation is available for the Earth on the perihelion than the aphelion?
A) no difference B) 1% C) 7% D) 15%
Desert soils take hundreds of years to recover from disturbances because of all of the following except
a. slow plant growth b. low species diversity c. high soil bacteria activity d. slow nutrient cycling e. lack of water