Most of the approximately 3,300 historic eruptions lasted ____
A)a few days
B)from less than one month to six months
C)one to two years
D)more than two years
E)more than 20 years
B
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Which of the following is most likely to be associated with a confined aquifer?
A) Perched water table B) Lake C) Artesian well D) Unsaturated zone
What element is used to link nucleic acids in all organisms?
a. Carbon b. Nitrogen c. Silicon d. Phosphorus
Which of the following represents chemosynthesis?
A) carbon dioxide + water + hydrogen sulfide ? sugar + sulfuric acid B) nitrogen + carbon dioxide + energy ? methane + oxygen C) glucose + oxygen ? water + carbon dioxide + energy D) water + carbon dioxide + energy ? glucose + oxygen + water E) glucose + water ? methane + carbon dioxide
What are three characteristics of communism, and how did they impact the industry and agriculture of eastern Europe?