How natural arches form
Автор: Nature Newsteam
Загружено: 2014-07-18
Просмотров: 27214
Описание:
http://www.nature.com/news/sandstone-...
Hydrologists have found an explanation for how fantastical arch structures can form in sandstone (see link above). To validate their model, the team also performed lab experiments.
They exposed 10-centimeter blocks of sandstone from a Czech quarry to erosion by water. The push of gravity distributed itself unevenly, which led to the formation of pillars (one in the first experiment, two in the second) that lasted longer than the surrounding material. The first sequence is a continuous recording of about 90 minutes, accelerated by 200x. The second is accelerated 100x in the first half, followed by two cuts, and the process lasted just over an hour.
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