The ________ is a seismic boundary between the crust and the mantle where there is a dramatic increase in seismic wave velocity
A) Schrodinger discontinuity
B) Greenschist facies
C) Low-velocity pathway
D) Moho boundary
Answer: D
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Which of the following methods would be most effective in preventing the evolution of pesticide resistance?
A) Using more pesticide whenever resistance appears in the pest population B) Using pesticides only during major outbreaks of pests C) Applying pesticides to the soil before planting and after harvesting a crop D) Using crop rotation and biological controls instead of pesticides
Which of the following statements about underground contaminants is false?
a. Degradable organic wastes do not decompose as rapidly underground as on the surface. b. There is little dissolved oxygen to aid in degradation of wastes. c. Waste products are diluted and dispersed quickly in underground aquifers. d. It can take hundreds to thousands of years for contaminated groundwater to cleanse itself of degradable wastes. e. In some coastal areas, groundwater has been contaminated by saltwater intrusion.
The Mistral is:
A) a foehn type wind. B) a Santa Ana type wind. C) a katabatic wind. D) an on-shore flow. E) an European sea breeze.
Farmers often appreciate a long, light rain over many hours after a long drought, instead of a sudden downpour. This is because a long, light rain permits better
A) infiltration. B) water-holding capacity. C) transpiration. D) soil fertility.