A measure of the economic impact of the young and old on the more economically active and productive members of a population is known as the
A) dependency ratio.
B) expectancy ratio.
C) youth-elderly cohort.
D) infant mortality rate.
E) crude death rate.
Answer: A
Answer: A
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A proposed explanation for an observed natural phenomena is a(n) ____________________. Fill in the blank(s) with the appropriate word(s)
Decreasing salinities and lower density, water near the equator is due to
A. upwelling conditions created by highly saline surface waters. B. stable conditions creating abundant rain. C. unstable conditions creating abundant rain. D. upwelling conditions created by freshwater surface waters.
If water had a lower specific heat capacity, ponds and lakes would be
A. less likely to freeze in winter. B. more likely to freeze in winter. C. actually, both of these D. none of the above
By 2100, the IPCC projects that sea level will rise by 26 to 98 centimeters.
Answer the following statement true (T) or false (F)