Which of the following cities would most likely experience issues with acid rain?
a. a city with urban heat island problems
b. a city with a large degree of hot pollution
c. a city with high levels of vehicle emissions
d. a city with a contaminated water system

Which of the following was used only once, to ratify the 21st amendment (repealing prohibition)? a.three-fourths of both houses of congress. b.three-fourths of the state legislature approved it. c.two-thirds of the state legislature approved it. d.ratifying conventions in three-fourths of the states approve it.