A layer of sediment that contains a mixture of sediments with various sizes is referred to as:

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Poorly sorted sediments contain a mixture of sizes, indicating that they have not been through a sorting process that would separate them by size. This can result in a wide range of sediment sizes in a single layer. Homogeneous refers to sediments that are all the same size, while well-sorted sediments have been sorted by size and contain a narrow range of sizes. Eroding sediments refer to sediments that are being worn away by erosion processes.

A Layer of Sediment That Contains a Mixture of Sediments