Slopes (Physical geography) (2) Impact (2) Culture (2) Management (2) Erosion (2) Erosión (2) Érosion (2) Pentes et versants (2) Impact (2) Gestion (2) Érosion (2) Culture (2) érosion (2) Département du Nord (1) Tunisie (1) Instruction and study (1) Testing (1) Deterioration (1) Reliability (1) Preservation (1) Conservation (1) Causes (1) Channels (1) Assaying (1) Agriculture (1) Moisture (1) Observations (1) Methodology (1) Specimens (1) Observations (1)