Which is one main source of water for the Himalayan rivers?

Glaciers and melting snow

Himalayan rivers receive water from more than one source. Snow and glaciers stored high in the mountains melt seasonally and feed streams and rivers, especially during warmer months. Rainfall, including monsoon rain, is another important source and can increase river discharge greatly. Because glaciers and snow continue to provide meltwater while rainfall varies, many Himalayan rivers are perennial, meaning they carry water through much of the year.

Option B is correct because glaciers and melting snow are a major source of Himalayan river water. Option A is wrong because desert rainfall is not the defining source, and the word “only” also excludes other sources. Sea waves do not supply these inland rivers, and underground oil is not water. The most complete school-level statement would mention both snow or glaciers and rainfall; among the given choices, “glaciers and melting snow” is the only suitable answer.

This is a Class 9 Geography question. Chapter: Drainage. Topic: The Himalayan Rivers.