The boundaries between landscape regions are usually indicated by sharp changes in

The boundaries between landscape regions are usually indicated by sharp changes in bedrock structure and elevation

Explanation:

Landscapes are the surface of the Earth's feature that shows the interface between air, water and ground. These are called atmosphere, hydrosphere and lithosphere receptively. Landscapes can be determined based on some of the things such as features shape, properties of the soil and land sloppiness.

The regions of landscapes can be easily determined by the elevation and the structure of bedrocks. The area that has high elevation are plateau and Mountains. The areas in which the elevations are at lower level they are Plain. The main reasons for the landscapes are weathering, erosion and composition of the bedrocks.