Chalk (5) Development (4) Evolution (4) craie (3) Water (3) temps (durée) (2) pierre (2) modèle (2) matériau (2) calcaire (2) paysage (2) karst (2) isotope (2) évolution (2) âge (2) grotte (2) France (2) Dynamics (2) Distances, etc (2) Employment (2) Varieties (2) Cartography (2) Altitudes (2) Mark, German (2) Geographic information systems (2) Minors (2) Witnesses (2) Topographical surveying (2) Tools (2) Time (2)