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Le type le plus courant et le plus utile de sable et gravier se compose de grains de quartz provenant de l’érosion des roches continentales voisines (le sable de quartz pur sert à la fabrication du verre); on en trouve aussi qui se composent de chaux (carbonate de calcium) provenant des coquilles ou de la précipitation d’eau de mer.
The most common and useful type of sand and gravel is composed of grains of quartz derived from the erosion of nearby continental rocks (pure quartz sand is used to make glass); other types of sand and gravel are composed of lime (calcium carbonate) derived from shells or precipitated from seawater.
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