The two most abundant gases in the atmosphere are
A) nitrogen and oxygen. B) water vapor and carbon dioxide.
C) nitrogen and water vapor. D) oxygen and carbon dioxide.
A
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Which feature on this diagram is a cirque?
A. 1, the circular depression at the head of the valley B. 2, a lake in the upper valley C. 3, a steep ridge D. 4, a valley that is above the level of the main valley
Which of the following cloud types are almost always composed of ice crystals?
A. stratus, stratocumulus, nimbostratus B. altostratus, altocumulus C. advection fog, upslope fog, radiation fog D. cirrus, cirrostratus, cirrocumulus
The term demographic transition refers to ________
A) the slowing down in the growth of a population as it approaches it biocapacity B) the slowing down in the growth of a population as it approaches the carrying capacity C) the decline in death rates followed by a decline in birth rates that occurred because sanitation levels in areas improved D) the decline in death rates and subsequent decline in birth rates that occur as a country economically develops E) a requirement for a population to reach a specific size before it becomes stable
In 1895 most of South America was semiperiphery
Indicate whether this statement is true or false.