Answer:
At the same time, Dubrovnik became a cradle of Croatian literature. The entire city was almost destroyed when a devastating earthquake hit in 1667.
Often, waterfalls form as streams flow from soft rock to hard rock. This happens both laterally (as a stream flows across the earth) and vertically (as the stream drops in a waterfall). In both cases, the soft rock erodes, leaving a hard ledge over which the stream falls
