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  • basalt level, embedded within the massive basalts, corresponds to the horizon within which the Biet Gabriel-Rufael church and all the other monuments of Lalibela have been carved. Many fracture systems of both natural (i.e. geological) and anthropic
  • , proneness of the slopes to landslides and increase of the anthropic impact during the last decades. The results are discussed. As a general conclusion, the semi-quantitative multi-criteria analytic hierarchy analysis is most sensitive to the input data.