The famed Leaning Tower of Pisa doesn't tip over because its center of gravity is
A. displaced from its center.
B. above support base.
C. relatively low.
D. stabilized by its structure.
Answer: B
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This very common carbonate mineral effervesces when it contacts dilute HCl. What mineral is it? 
A. pyrite B. hematite C. calcite D. dolomite E. magnetite
Due to proximity to these markets, resources in the Russian far east are marketed to countries such as:
A) Ukraine and Moldova B) Saudi Arabia and Qatar C) United Kingdom and France D) Japan and China
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