State a few advantages of plains.

A few advantages of plains are:

1. Construction of settlements, rails, roads, etc. is easy on flat and soft surface.
2. Fertile soil of alluvial plains are granaries of the world. In arid areas, irrigation can be provided easily and economically.
3. Most of the big cities are situated in plains as most of the plains provide fine climate and fertile land. Movement is easy which encourages agricultural and industrial development.