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Which of the following soil has the best water retention?

1. Sandy soils
2. Clayey soils
3. Silt soils
4. Gravelly soils

Correct answer: Clayey soils

Solution

Water retention by soil type (best to worst): Clay > Silt > Sandy > Gravel. Clay particles are extremely small (< 0.002mm), providing large surface area and small pores that hold water well. Sandy soils have large particles and large pores — poor retention. Gravelly soils drain even faster.

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