Question

how is sundarban delta formed

Answer 1

Sunderban delta has been produced by deposition of sediments over thousands of years by the Ganga and the Brahmaputra.
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Answer 2

Delta is a type of geographical landform which is formed by the deposition works of river flow in it's mouth.

Similarly,the Sundarban delta was also formed by the deposition works of the Ganga and Bramhaputra river.This deposition procedure took thousands of year and formed the today's Sundarban delta landform.

Due to the river deposition this delta is very fertile for harvesting and natural vegetation growing.