Balade sur un grain de sable
LA GLACE
Sous climat froid, les grains peuvent être soumis aux influences glaciaires. Violemment pressés les uns contre les autres, ils vont alors être affectés de figures de broyage, dont la morphologie caractéristique (EX 19) traduit une pression accompagnée d’un mouvement circulaire.
Trace de broyage
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