A piece of rock fell off in front of witnesses.

A piece of rock fell off in front of witnesses.

It’s a good thing there weren’t any people around, otherwise the outcome would have been very deplorable.

What’s a rockfall?
Sometimes in the mountains, huge boulders of rock fall off. Crumbling down, these rocks break apart, cluttering up the valleys. This phenomenon is called a rockfall. A powerful rockfall can erect a dam on a mountain river. It forms a lake that fills the upper part of the valley. Usually such lakes are short-lived and the water, reaching a certain level, breaks the dam and, sweeping away everything in its path, rushes down, causing catastrophic floods.

How does a stone sharpen the water?
Moving water is able to erode and destroy rocks. This process is called erosion (in Latin it means “erosion”). Any river – both a mountain and a plain river – has an erosion capacity. But the destructive power of mountain streams is especially great, as due to the large difference in height they are distinguished by strong currents and are able to carry not only silt and sand, but also stones, and this is exactly the abrasive material with which the mountain river “gnaws” the passage, even in the mountain ranges, slowly rising in the process of urban formation on the path of an already formed mountain stream.

rockfall

rockfall

rockfall

rockfall

rockfall

 

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