What role does water play in generating magma?
A) Water lubricates the path for subducting plates, allowing them to subduct deeper.
B) Water lowers the density of the rock, allowing it to melt.
C) Water cools the rock, preventing melting.
D) Water lowers the melting temperature of the rock, allowing it to melt.
Answer: D
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The layer of quartzite in this photograph would mostly weather by
A) dissolution.
B) hydrolysis.
C) physical weathering.
D) spontaneous combustion.
When food is irradiated with gamma rays from a cobalt-60 source, does the food become radioactive? Why?
A) Yes. This is why irradiation with cobalt-60 is no longer approved by the FDA. B) Yes. However, the radioactivity resulting is well below the danger level established by the FDA. C) No. The gamma rays do not have sufficient energy to initiate the nuclear reaction in the atoms of the food. D) Yes and No. Although the gamma rays initiate the nuclear reaction the radioactivity does not show up until the food is ingested.
What is a "qanat"?
A) an irrigation system, developed in Iran, that taps into groundwater through a series of gently sloping tunnels B) a type of subsistence agriculture practiced on oases C) a formal title given to the monarch (national leader, like a king or queen) in the country of Saudi Arabia D) the practice of seasonally moving livestock to cooler, greener, high country pastures in the summer, then returning them to valley and lowlands for fall and winter grazing E) water supplies stored underground during earlier and wetter climatic periods
The H1N1 flu virus is common in ________ but rarely transmitted to humans until recently
A) pigs B) waterfowl C) mosquitoes D) poultry E) birds