7. STRUCTURAL PLAINS
Due to endogenic forces,an area can be raised or lowerd.These
actions are called uplifit and subsedience respectively.These actions
cause plains to be formed.They are called structural plains.
8. EROSIONAL PLAINS
Some areas on the earth`s surface which originally were rugged are
leveled due to friction or plantation.This is possible due to the action of
several agents.The plains that are formed thus are called erosional plains.
9. DEPOSITIONAL PLAINS
Running water,winds,glaciers, seawaves, and other external
agents,carry rocks materials from the hills to depressions on the surface
of the earth or to the water bodies.In course of time these leads to
formation of plains