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Farmers settle near active volcanoes despite the obvious dan. Volcanic ash contains minerals such as potassium and phosp that ordinary soils lose through eros. When ash weathers, these nutrients are rele into a form that plant roots can abs. The resulting soil holds water well and stays fert for centuries. On Java, some of the world's densest farming popula sit on the slopes of volcanoes that have erup within living memory. The gamble is deliberate: an eruption may destroy a harvest, but the depo it leaves eventually enri the land.