Question

Geographical reason:
All rivers do not form a delta
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Answer 1

Answer:

Most rivers flowing west from the Western Ghats do not form deltas because of the high gradient and they don't have to travel much distance to drain into the sea. As a result, they don't carry much sediments because they don't have the time to.

Answer 2

Answer: All rivers do not form a delta.

Explanation: All rivers do not form a delta because in order to do so, a river has to have enough time and low enough velocity to deposit its silt. But in some rivers (Eg. rivers flowing from western ghat), they do not get enough time (they get drained into the sea quickly) or have a high velocity and thus do not get too deposit silt and thus don't form deltas.