As a country moves through the demographic transition, we can expect its elderly support ratio to
A) increase.
B) decrease.
C) stay the same.
D) None of these: the elderly support ratio isn't affected by the demographic transition.
Answer: A
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Which of the following statements describes an acidic solution?
A. [H3O+] > [OH-] B. [H3O+] < [OH-] C. [H3O+] × [OH-] ? 1 × 10-14 D. [H3O+]/[OH-] = 1 × 10-14 E. [H3O+]/[OH-] = 1
Which well is least likely to need pumping?
A) a well that reaches water very near the surface at an unconfined sand and gravel aquifer B) a well that is drilled below a confining shale layer to a confined sandstone aquifer C) a well that is drilled deep in an unconfined sandstone aquifer D) any well in a limestone aquifer
Careful management and use of resources to assure continuing availability in the longer run is ________
Fill in the blank(s) with correct word
Typically, water vapor occupies about what percentage of the air's volume near Earth's surface?
a. ?about 78 percent b. ?about 21 percent c. ?close to 10 percent d. ?less than 4 percent e. ?less than 1 percent