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Overview of pebbles
Jan 09, 2017

The pebbles, 6 is the exploitation of yellow sand, because called the goose egg. Pebbles as a kind of natural stone material, from experienced thousands of years ago after the movement of the earth's crust uplift by ancient riverbed of sandstone in the mountains, experiencing the mountain torrent shock, water transport in the process of continuous extrusion and friction. In the process of tens of thousands of years of vicissitudes of life evolution, they endure waves playing water sports, friction is gravel collision lost irregular edges, and sediment buried deeply under the ground in a silent for ten million years.