Is a hill of rock that resist weathering and erosion by a river?

A rock that resists weathering and erosion from a river is likely composed of durable rock types like granite or quartzite. These rocks can withstand the abrasive forces of the river's flow, leading to the formation of a hill or outcrop. Over time, the resistance of these rocks to erosion can create prominent features in the landscape, such as waterfalls or ridges.