How are plains formed?

# Plains are formed when everything in the land weathered or eroded away, leaving the land flat. # Another way the plains are formed is when a volcano erupts and burns everything in its way, all that is left are the plains. This makes bare land or barren plains.
Plains are formed in several different ways. The most common are from a dried up lake or a glacier moving past an area. Both of which leave a flat almost concave surface which geologists call a plain.