With one-tenth of the world's population, sub-Saharan Africa had ________ of the world's total HIV positive population and nine-tenths of the world's infected children
A) one-fifth
B) a quarter
C) half
D) two-thirds
E) three-quarters
Answer: D
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When viewed from the surface, which of the following cloud types are associated with the smallest individual cloud elements (that is, puffs)?
A. cirrocumulus B. stratocumulus C. altocumulus D. cumulus
Which of the following statements regarding a nucleon is true in regards to nuclear reactions?
A) A nucleon inside a nucleus has a lower mass than a nucleon outside of the nucleus. B) The number of nucleons changes in a nuclear reaction, therefore the mass changes. C) A nucleon has a higher energy inside a nucleus, and releases it when it undergoes nuclear reactions. D) A nucleon's mass is constant. E) A nucleon is more stable outside the nucleus.
What is the main frame of reference for GPS measurements?
A) rock compositions B) satellite locations C) Earth's magnetic pole D) the absolute value of Earth's core
The extremely low surface temperatures in the Antarctic in July (the Southern Hemisphere's winter) clearly demonstrate the principle of ________
A) adiabatic cooling B) latitudinal differentiation C) greater cooling of land than water D) lapse rates E) aphelion