<P> Relief (or local relief) refers specifically to the quantitative measurement of vertical elevation change in a landscape . It is the difference between maximum and minimum elevations within a given area, usually of limited extent . The relief of a landscape can change with the size of the area over which it is measured, making the definition of the scale over which it is measured very important . Because it is related to the slope of surfaces within the area of interest and to the gradient of any streams present, the relief of a landscape is a useful metric in the study of the Earth's surface . Relief energy, which may be defined inter alia as "the maximum height range in a regular grid", is essentially an indication of the ruggedness or relative height of the terrain . </P> <P> Geomorphology is in large part the study of the formation of terrain or topography . Terrain is formed by intersecting processes: </P> <Ul> <Li> Geological processes: Migration of tectonic plates, faulting and folding, volcanic eruptions, rivers . </Li> <Li> Erosional processes: water and wind erosion, landslides . </Li> <Li> Extraterrestrial: meteorite impacts . </Li> </Ul> <Li> Geological processes: Migration of tectonic plates, faulting and folding, volcanic eruptions, rivers . </Li>

In term of relief the maximum area of india is covered under