Question

why does Bhramaputra in its Tibetan part have less silt, despite a longer course
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Answer 1

Answer:

Tibet is basically a very cold and dry area, thus, the river carries very small amount of water leading to vary less spilt content, desipit having a large course.

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Answer 2

Answer:

Bhramaputra in its Tibetian part have less silt because Tibetian regions are cold mountainous region where there is only ice. That's why, inspite of a longer course, Tibetian part has less silt.