The solar angle
A) is the same at the Arctic Circle and at the equator on the solstices.
B) affects the degree of beam spreading.
C) is lowest in the Northern Hemisphere during its winter.
D) is lowest at the North Pole during its summer.
Answer: B
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Canada's most important industrial region is northeastern Ontario
Indicate whether the statement is true or false.
What would explain the poor condition for biological productivity in the open tropical ocean??
A) ?Converging currents produce downwelling, thus carrying nutrients to the deep ocean. B) ?Gyres contain pollution and decaying organisms that use up available nutrients. C) ?Upwelling delivers seafloor sediment to the surface, thus blocking necessary sunlight for photosynthesis. D) ?Strong layering isolates deep, nutrient-rich water from the sunlit ocean surface.
Which of the following is true of the atomic weight of an element?
A) It is the weight of heaviest isotope. B) It is the weight lightest isotope. C) It is the weight of the most abundant isotope. D) It is a weighted average obtained from the weights and abundances of the isotopes.
Use the soil texture triangle to name the following by its correct texture class (named on Figure 28.2):
a) 17% sand, 28% silt, 55% clay:
b) 31% sand, 55% silt, 14% clay: