Which sediment size is finer than sand but coarser than clay?

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Multiple Choice

Which sediment size is finer than sand but coarser than clay?

Explanation:
Grain size classification places clay as the finest, then silt, then sand as the coarsest. Clay particles are very small, typically less than 0.002 mm; sand particles are larger, roughly 0.05–2 mm; and silt sits in between, about 0.002–0.05 mm. So the sediment that is finer than sand but coarser than clay is silt. The other options aren’t about grain size—terrigenous sediment refers to origin from land, the aphotic zone is a depth in the ocean, and adhesion is a sticking process.

Grain size classification places clay as the finest, then silt, then sand as the coarsest. Clay particles are very small, typically less than 0.002 mm; sand particles are larger, roughly 0.05–2 mm; and silt sits in between, about 0.002–0.05 mm. So the sediment that is finer than sand but coarser than clay is silt. The other options aren’t about grain size—terrigenous sediment refers to origin from land, the aphotic zone is a depth in the ocean, and adhesion is a sticking process.

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