Final answer:
Waterfall formation is related to erosion when a river flows over areas of hard and soft rocks, resulting in the formation of steep drops or waterfalls.
Step-by-step explanation:
The process of waterfall formation is closely related to erosion. A waterfall is formed when a river flows over an area of hard rock followed by an area of soft rock. The continuous flow of water erodes the soft rock more easily, resulting in the formation of a steep drop or vertical cliff known as a waterfall. The hard rock above the waterfall is more resistant to erosion, which causes the water to maintain its flow and creates the distinct feature of a waterfall.
Learn more about Waterfall formation and erosion