Fig. 7From: Sustainability problems of the Giza pyramidsa Permanent deformation of blocks in the zone of borders of the façades and corners of the great pyramid of Khufu. The increasing weakness of the structure after earthquake causing the friction and sliding between the facing and backing blocks. b Show extremely slow degradation process which affected the backing stone blocks of the great pyramid, many blocks were detached. The outer casing stone blocks fell down completely in 1303 strong earthquakeBack to article page