Decreasing the sulfur emissions from coal has:
A) contributed to the warming temperatures.
B) caused some cooling to occur, but not enough to combat greenhouse gases.
C) decreased the amount of acid rain.
D) both A and C.
Answer: D
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Portuguese is spoken by nearly everyone in Portugal. The Portuguese ethnic group also comprises 99% of the population. This "marriage" of culture, ethnicity, and political sovereignty makes Portugal a good example of a:
A) multilingual society B) Indo-European country C) nation-state D) lingua franca
Which of the following physical properties would you expect for krypton (Kr)?
A) a gas at room temperature B) hard C) brittle D) shiny E) conducts electricity
The environmental effects of damming rivers for hydropower are minimal
Indicate whether the statement is true or false
Earth's surface receives more solar radiation near the equator than at the poles. This uneven heating of Earth's surface produces
A) day and night. B) dry air at the equator. C) clouds. D) winds.