Average atmospheric CO2 concentrations have ____ over the past 100 years
A) slightly decreased
B) remained constant
C) significantly decreased
D) increased
D
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China's "Great Leap Forward"
A) was responsible for China becoming the economic world power it is today B) occurred in tandem with the "Cultural Revolution." C) occurred against the wishes of Mao Zedong. D) took place in the late 1980s. E) led to a major famine as the government melted down peasants' farm tools.
Europeans comprised more than 90 percent of immigrants to the United States during the nineteenth century, and even as recently as the early 1960s, still accounted for more than 50 percent
Indicate whether the statement is true or false.
Winds at the ____ level help "steer" atmospheric storms
A) 300mb B) 800mb C) 700mb D) 900mb E) 500mb
A(n) ________ is a trembling or shaking of the ground caused by the sudden release of energy stored in rocks beneath the Earth's surface.
A. earthquake B. volcano C. tsunami D. rupture E. rumble