Final answer:
Dendritic drainage forms when smaller tributaries merge into larger rivers, creating a tree-like pattern. It is commonly found in areas with uniform rock types and gentle slopes.
Step-by-step explanation:
Dendritic drainage forms when a river network resembles the shape of a tree, with smaller tributaries merging into larger rivers. This type of drainage pattern is common in areas with uniform rock types and gentle slopes, where the main river channels are formed by the merger of smaller streams. Dendritic drainage can be found in various landscapes around the world, such as the Amazon Rainforest in South America or the Mississippi River in the United States.