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Heritage sites are at risk from natural forces. The longterm natural forces, such as wind ,water and temperature, can gradually wear down heritage sites. For instance, the Great Pyramid of Giza is now several metres shorter than it was originally. Natural disasters, the sudden and powerful natural forces, can lead to the destruction of heritage sites in 2003,a terrible earthquake shook southeastern Iran and ruined large parts of the city of Bam, an incredible UNESCO cultural heritage site.