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A glacier collapse caused a massive flood disaster in Sikkim, India, in 2023. Scientists linked the event to climate change.

The reason why rivers start here is because mountains receive the highest amounts ... As a river travels downstream, it erodes the landscape. Erosion is when land is worn away by another material.

Smaller, upstream rivers (typically closer to mountains) are showing an inverse pattern: 17% are seeing an increase in flow. (Though, Gleason points out, this is not uniform, as 10% are decreasing.) ...