Which of the following is the only viable explanation for the documented and observable recent climate changes, including the increased average temperature of Earth's surface?
A) Changes in the Sun's brightness
B) Major volcanic eruptions
C) Release of human-caused emissions
D) Reversed magnetic polarity
E) Variations in Earth's orbit
C
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Control of the spread of HIV/AIDS is hindered by all of the following except
A. lack of medical understanding B. apartheid C. poverty D. "social marketing" of condoms
cT air masses usually form
A) in summer. B) in high-latitude areas. C) in moderately cool areas. D) large quantities of rain-producing clouds.
How many people in New York City would be directly affected by a
Category ? storm surge? What will be an ideal response?
The UN computes the Human Development Index (HDI) by considering these three main factors
A) a decent standard of living, a long and healthy life, access to knowledge B) a decent standard of living, number of children, level of education C) level of education, income, and access to medical D) level of education, access to entertainment, a long and healthy life E) happiness, education, health