During the Little Ice Age, ____
A) the climatic optimum occurred
B) sea level was lowered by about 280 feet
C) alpine glaciers grew in size and advanced
D) continental glaciers covered large portions of North America
C
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For a rock to be considered an ore, it must
A. be shiny or otherwise noteworthy. B. contain enough of a commodity to be mined at a profit. C. contain some copper or gold. D. contain either quartz or sulfide minerals. E. be located in a mine.
A cT air mass is:
A) warm and humid. B) cold and dry. C) cold and humid. D) warm and dry.
What is the underlying geologic explanation for why western South America is so different from eastern South America?
A. The western side marks a plate divergence and the eastern side marks a plate convergence. B. The western side is a plate boundary and the eastern side is not. C. The eastern side is a plate boundary and the western side is not.
What type of volcano has the most violent eruption?
A. caldera B. shield C. composite