Sir David explains how the characteristics of a river change and how dramatic scenery results from the erosion of rocks. He also explains how waterfalls form in the upper course of a river and ...

I mean, water carved this cathedral out of nothing. DR DAVE THAYER: Yep. MICHIO KAKU: And how long has this erosion been taking place? DR DAVE THAYER: Well at least 5.5 million years is what they say.

Biswajit Bera, an Assistant Professor of Geography at Sidho Kanho ... crore has been sanctioned to combat erosion along 1.825 kilometers of the Kangsabati River in Binpur-1 block.