In the United States, coal-burning power plants produced what percentage of the electricity in 2015?
A. 2%
B. 9%
C. 33%
D. 52%
E. 68%
Answer: C
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The light blue area just off the Australian coast, as shown here, is called the
A. seashore. B. continental platform. C. continental shelf. D. abyssal plain.
During a ________ year period starting at about 4.5 billion years ago, bits and pieces of metal-rich particles, rocks, and ices accumulated to form the Earth.
A. 10-300 billion B. 3-10 million C. 30-100 million D. 1-10 million
If a chemist wishes to carry out a reaction in which one reactant is a solid and one is a liquid, which of the following will be most effective in speeding up the reaction?
A) adding more liquid reactant B) grinding the solid to a form a powder C) placing a larger crystal of the solid in the same volume of liquid reactant D) All of the above will be equally effective.
"Birth dearths" can be a problem because they cause
A. Labor shortages B. A decrease in workers C. Military weakness D. A decrease in taxpayers E. All of these are correct