Yes, rain causes erosion both by the force of rain falling and the water flows that result from rainfall. This erosion then degrades rock faces creating more sand. In deserts far from the ocean rainfall plays a large part in the overall sand formation. Additionally, if the prevalent rock is softer, like gypsum and selenite, rain can play a much larger part in erosion. Sand is also formed by wave action, wind and the flow of rivers and streams.
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