| A | B |
|---|
| urban ecology | approach to studying cities that examines the relationship between people and the environment |
| population | number of people living in an area at a particular time |
| expressive | type of crowd with no apparent goal or purpose |
| casual | least organized and most temporary type of crowd |
| urban legends | stories that teach a lesson and seem realistic but are untrue |
| collectivities | groups that exhibit collective behavior |
| public opinion | different opinions that members of the public have about a particular issue |
| emergent-norm theory | Collective behavior occurs when people are faced with a situation in which traditional norms of behavior do not apply |
| demography | study of human populations |
| life expectancy | average number of years that a person born in a particular year can expect to live |
