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Update Rollers Rollers

http://natureinquiries.wordpress.com/2008/11 / 18/glacial-drift-comparison /

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Why are they pebbles round?

's column Jean-Luc Nothias
15/10/2007

rolling stone gathers no moss. But
swells and becomes soft. Is it really because they are rolled by the surf of the sea or river beds that the rollers become smooth and round? A simple observation allows us to understand that this explanation is clearly inadequate: in a mountain stream, there are round stones up and down its course. If their appearance was determined by the action of the current, which in coaching, would use as and when its descent, we should find that downstream, not upstream. This is not the case.

Various erosion process may be at work in training wheels. The most important role of polishing stones can be held by the grains of sand, driven by the current, polish rock. A stone may therefore become round and smooth without leaving the location.

40 000 tonnes per year of new rollers

(....) More> www.lefigaro.fr

Prohibition of picking up the pebbles ...
The flint pebbles are among the earliest objects used by humans since prehistoric times. They are probably the first tools. Pebbles drilled, for example, served as ballast for the nets of fishermen. The nineteenth and twentieth e

e ^{centuries they were used both as decorative object, but also for the manufacture of glass or to be embedded in concrete or special coatings. It is said that Norman rollers were used to build tracks from the launch pad at Cape Canaveral. The Normandy beaches have also been exploited so that since 1975,} it is forbidden to collect pebbles.

It is estimated that over two centuries, the mass of pebbles collected is equivalent to the stock remaining on the entire coastline. (....) More> www.lefigaro.fr

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The Rollers Tréport:
The rollers form a cordon at the foot of the cliff, and protecting it from erosion.

Since 1985, he was forbidden to use the rollers on the coast of Seine-Maritime.

The pebbles are the most popular. It is used in industry as a crusher, to obtain a fine powder that comes in the composition of medicines, cosmetics ...

The roller gray is very rich in silica. Once fired at 1600 ° C, it is used in painting, Faience (in England, the famous Wedgwood porcelain), and also in toothpastes. Read more on the following link:>

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