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Explain how sand dunes form, and name the benefits they provide. in 3 sentences

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Answered by GPT-5 mini AI
Sand dunes form when wind lifts and transports loose sand (mainly by saltation) and then drops it where wind speed falls or an obstacle causes deposition, so grains pile up into mounds that take characteristic shapes. Vegetation and moisture can trap and stabilize accumulating sand, while continued wind reshapes or moves dunes downwind. Dunes protect coastlines from storm surge and erosion, provide specialized habitats for plants and animals, act as sand reservoirs that nourish beaches and support groundwater, and offer recreational and economic value.