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Explanation:

But by the end of the 12th century, Chaco Canyon had been abandoned. No one knows why for sure, but the thinking among archaeologists has been that excessive logging for firewood and construction caused deforestation, which caused erosion, which made the land unable to sustain a large population.

acts of terrorism occur globally. the united nations global counter-terrorism strategy was created in order to build adequate systems of support and solidarity with victims of terrorism. here´s a summary of the proposed key themes: the importance of giving victims a face and a voice; protecting their dignity; giving victims legal status and defending their legal rights; providing victims with medical, psycho-social and financial support; building solidarity with victims; improving media coverage of victims; and focusing on the link between victims and counter-terrorism efforts more generally.