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urce of uranium and thorium mining, uranium enrichment, nuclear waste disposal, nuclear weapons explosions, nuclear experiments, coalfired power plants, phosphate ore mining processing. Easily adsorbed by the soil, the residence time is longer. Third. Hazards and the status quo of the land Hazard: pollution worsens already strained more shortage of arable land resources pollution tremendous threat to people39。s health pollution to adverse impact on agricultural development has brought great pollution is also an important reason to cause environmental pollution in soil pollution migration and retention, and may continue to cause land contamination pollution seriously jeopardize the interests of future generations, is not conducive to the sustainable development of the rural economy Currently, the uproar cancer villages. China cancer village space distribution is very uneven, in addition to the four provinces of Tibet, Qinghai, Gansu, Ningxia has not been found outside the village of cancer, are distributed in 27 provinces across the country, the number of significant differences between these provinces cancer village. Number of cancer Village in Henan Province, more than 39 is the greatest. Causes, removal of part of the formation of the unexplained cancer villages, the formation of the cancer villages remaining 90% are associated with modern industrial pollution. Such factories and mines mainly include chemical plants, printing and dyeing, paper mills, pharmaceutical plants, tanneries, alcohol plants, power plants, lime kilns, where the chemical plant caused environmental pollution lead to the the cancer villages phenomenon most mon. Status: At present, the overall situati