Understanding Main Ideas
28 What are the two main differences between Pluto and the gas giants?
29 Why doesn't the gas on a gas giant escape into space, as it has on
Mercury?
30 What object in the solar system has a composition similar to that of the gas
giants?

The technique of getting a commitment from a potential customer and then changing the terms of the agreement is best described as low-balling. cognitive dissonance. reciprocal concession. the foot-in-the-door technique. a half-dozen high school students are going to a concert. chantal wants to wear a new colorful outfit that she just received as a gift, but she assumes that her five friends will all be wearing nothing but black leather. chantal decides to do likewise, and leaves her colorful outfit in the closet. chantal’s behavior is an example of conformity. resistance. reciprocation wariness. idiosyncrasy credits.