Winding ridges of sand and small bits of gravel formed from the outwash of a melting glacier are called

Moraine. The glacial formation of the collection of loosely arranged glacial debris which may include rock, sand, and soil that occurs in recently glaciated and previously glaciated parts on Earth is called moraine. It may contain debris ranging in size from sand-sized glacial flour to huge boulders.

Winding ridges of 'sand' and 'small bits of gravel' formed from the out-wash of a 'melting glacier' are called eskers.

Explanation:

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