Chimney-like structures around hydrothermal vents on the seafloor where various metal sulfides precipitate out and accumulate are called ____.
A. white towers
B. brown mounds
C. black smokers
D. blue chutes
E. gray tubes
Answer: C
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Which of the following atmospheric conditions °Ccurs when the environmental lapse rate decreases more rapidly with height than the dry adiabatic rate?
A. absolutely unstable B. absolutely stable C. convectively unstable D. conditionally unstable
Match the term with the appropriate phrase. layer of the ocean that experiences a rapid change in salinity with depth
-pycnocline -condensation -evaporation -halocline -sublimation
The rainy season in Mediterranean climate regions is _______________
Fill in the blank(s) with correct word
Why might the following nuclear reaction not be very good for energy production in a fission reactor?
U ? 
Ba + 
Kr + 1 neutron
A. The mass of the by-products is too high and therefore the energy released will not be high enough. B. The material only produces one neutron so the chain reaction will not be very efficient. C. Interatomic attraction between the products will impede the efficient separation of the atoms from the unstable nuclei. D. There are too many products produced. E. The products are too large.