What negative impact did gold and silver mining have in the west? a. tent cities near the mines fostered criminals as long-term residents. b. ghost towns were left behind after the mines stopped producing. c. mining camps were sources of many contagious diseases. d. mass migration from the east coast led to social tension among merchants.

As nina and erin were eating lunch in the central high school student cafeteria, they were discussing the news coverage about the girls' athletic coach being arrested for selling steroids to student athletes. "i think the guy just did it because they don't pay teachers enough money," nina suggested. "i bet the guy had some other kind of drug addiction he was trying to pay for," erin countered. nina and erin's ideas about the cause of the coach's drug-selling behavior are examples of: