An advertisement uses a movie star holding a bottle of perfume. this ad is an example of which of the following?
a. an appeal of association.
b. an appeal to reason.
c. an appeal to economics.
d. an appeal to patriotism.

Atemperature inversion can cause a warm air mass to move over a colder air mass. this traps the colder air mass and prevents surface air from rising. this may result in which of these? a) smog b) acid rain c) freezing rain d) a thunderstorm