Why is the western coastal plain is devoid of any delta?
The western coastal plain is devoid of any delta because it is a submerged coastal plain. Due to this submergence, it forms a narrow belt along the coast. The rivers flowing through this coastal plain do not form any delta.
In contrast, the eastern coastal plain is an emergent coast which is broader and has well-developed deltas formed by rivers like the Mahanadi, Godavari, Krishna and Kaveri. The submerged nature of the western coast prevents the accumulation of sediments required for delta formation.
Explanation
The textbook clearly states that the western coastal plains are an example of a submerged coastal plain. This submergence makes it a narrow belt. The context explicitly mentions that 'The rivers flowing through this coastal plain do not form any delta.' The contrast with the eastern coast (emergent coast with deltas) further explains why the western coast lacks deltas.