How does geology affect the formation of river landforms?
The geology of an area influences the rate of river erosion. Rivers flowing over hard rock have a slower rate of erosion as the bedrock is more resistant. However, areas with soft rock are more likely to experience greater rates of erosion.
Those landscapes that consist of more resistant rock are more likely to have steeper valley sides, whereas areas with less resistant rocks tend to have more gentle sloping valley sides.
Rivers will always follow the path of least resistance. Therefore, in areas where there are both hard and soft rocks, river channels are more likely to form along the path of the softer rock.
The types of erosional landforms that develop along the course of a river depend on the geology of the area. Landforms such as waterfalls and gorges are often found along boundaries between hard and soft rock.