Pourquoi il y a du sable dans la forêt de Fontainebleau ? Son origine est due à l’évolution géologique du lieu : il y a 30 millions d’années, un océan d’eau chaude recouvrait le site, déposant au fond du quartz qui s’est ensuite désintégré en sable. Autour de cette immense mer de sable se trouvent…
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