How did the Himalaya mountains contribute to making the northern plains India's most fertile region?

The Himalaya mountains play a crucial role in making the northern plains of India the most fertile region by acting as a barrier that captures moisture-laden winds from the southwest. This leads to heavy rainfall in the foothills, which in turn feeds numerous rivers like the Ganges and Brahmaputra. These rivers carry nutrient-rich silt from the mountains, depositing it across the plains during seasonal floods. As a result, the alluvial soil enriched with minerals supports diverse agricultural practices, making the northern plains highly productive.