Final answer:
Closer together contour lines indicate steep terrain or a rapid change in elevation, while farther apart contour lines suggest a gentle slope or a gradual change in elevation.
Step-by-step explanation:
When contour lines are closer together on a map, it indicates steep terrain or a rapid change in elevation. This can be seen as an indication of mountains or cliffs. On the other hand, when contour lines are farther apart, it suggests a gentle slope or a gradual change in elevation. This can be seen in flat or rolling landscapes.