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An alluvial fan forms when a stream or river loses energy as it flows from a narrow valley onto a broader, flatter area, typically at the base of a mountain or hill. As the water slows down, it deposits sediment it carried, creating a fan-shaped, sloping accumulation of materials. Over time, these deposits build up, creating a distinct landform characterized by a wide, gently sloping surface. The process can be influenced by factors such as changes in water flow, sediment supply, and climatic conditions.

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5m ago

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