Prior to the Ice Age, the Great Lakes were nonexistent. Indicate whether the statement is true or false
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In 1970, the U.S. passed the Clean Air Act which limited emissions from stationary (industrial) sources, including coal-burning power plants. Why has this law not been as successful as hoped in reducing air pollution?
A. The older coal-burning and industrial plants were not required to comply with the law. B. Coal-burning plants built after 1970 were not required to comply with the law. C. The U.S. started importing coal from China which produces more emissions. D. Emissions from coal-burning plants in Iceland have offset our reductions.
Which of the following best represents the sequence by which a continent splits apart?
A) Seafloor spreading, then continental rifting, then uplift due to mantle upwelling B) Continental rifting, then seafloor spreading, then uplift due to mantle upwelling C) Uplift due to mantle upwelling, then continental rifting, then seafloor spreading D) None of these are correct.
What proportion of urban Americans lives in central cities?
A. one-tenth B. one-quarter C. one-third D. one-half E. two-thirds
The many parallel ridges and valleys of the large Basin and Range region of the western United States are the result of normal faults
a. True b. False Indicate whether the statement is true or false