Some basins in the desert southwest were filled with water during the last glacial period.
Answer the following statement true (T) or false (F)
True
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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.
The typical form for a composite volcano is a
A) steep-sided cone. B) shallowly sloping shield. C) broad, circular crater. D) steep-sided dome.
Large-scale karst topography occurs primarily in ____
a. North Dakota b. the north-central Mediterranean region c. Russia d. Antarctica
Of the places listed below, ocean waters generally have the least salinity in ________
A) subtropical zones B) polar regions C) small seas and gulfs D) hot places E) places with lack of rainfall