Question

Simply define what is residual hills

Answer 1

Residual hills are formed after agents of denudation like that of wind, rain, and ice have eroded the already existing mountain.

• It is a formation by weathering and erosion in different climatic regions. The agents of denudation erode the soft rocks, therefore, the residual hills majorly have hard rocks as its remnants.
• Residual hills have a dome like structure due the process of weathering. The dome shaped structure is known as 'inselberg'.  
• The Sierras of Spain and the Aravallis of India are a great example of residual hills.