The world's population had reached 3.0 billion just after the year:
A) 1850
B) 1930
C) 1960
D) 2010
C
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Spheroidal weathering refers to ____
a. rounded boulders left by weathering along joints b. rounded holes or caves left in sandstone cliffs due to hydration c. rounded rocks split into two halves by thermal expansion and contraction weathering d. weathering by round salt crystals
A difference between the innate immune system and the acquired immune system is
A) the innate immune system includes many more different types of receptors than the acquired immune system. B) the innate immune response is immediate, whereas the acquired immune response is delayed, peaking about 3 to 5 days after exposure. C) the innate immune system retains a memory for past exposure, with subsequent responses being faster and more aggressive; the acquired immune system does not. D) each acquired immune system cell responds to a greater number of different pathogens than each innate immune system cell.
What is a region in the atmosphere where air temperature remains constant with height?
A) temperature inversion B) jet stream C) isothermal zone D) hypoxic zone
Lake-effect snowfall:
A) is most common in late winter. B) requires that the lake be relatively warm. C) extends for up to 100 miles south of the lake. D) requires the presence of stable air.