If river velocity decreases in the Ganga Brahmaputra delta, what will happen to sediments?

Correct answer: They will deposit more

The direct answer is A: sediments will be deposited more as river velocity decreases. A river can carry sediment only while its moving water has enough energy. When the river enters the broad, gently sloping Ganga-Brahmaputra delta, its channel becomes slower and the flow may divide into distributaries. Lower velocity means lower carrying capacity. First, the largest and heaviest particles settle; with further slowing, finer silt and clay also settle. This deposition gradually builds delta land. Option A is correct because slower flow promotes settling and accumulation of sediments. Option B is wrong because sediments do not always disappear; many are deposited on the bed, banks, or delta surface, although some may still be carried farther by currents. Option C is wrong because sediment cannot turn into a glacier; glaciers form from accumulated snow and ice under suitable cold conditions. Option D is wrong because tides are movements of seawater caused mainly by the gravitational pull of the Moon and Sun, not transformed river sediment. The exact process is: velocity decreases, carrying power decreases, sediment settles, and deposition increases. Memory cue: fast water transports; slow water deposits.