A brown mass—a mixture of water, boulders and fine matter—plows through the landscape. The mountains wash more than a thousand lorryloads of material into the valley on a fairly regular basis, causing damage in excess of CHF 100 million per year in Switzerland alone. A better understanding of t...

Source: [Phys.org](https://phys.org/news/2026-06-drone-surveys-reveal-steep-alpine.html)

Sponsored