Which soil type is characterized by a mixture of pore spaces?

The correct answer is silt soils, which are characterized by a mixture of pore spaces that allow for better drainage and aeration compared to clay soils, while still retaining moisture more effectively than sandy soils. Silt particles are smaller than sand but larger than clay, resulting in a texture that offers a balance of drainage and water retention. This composition contributes to a medium-fine texture that supports good plant growth by providing adequate space for air and water movement, while still being capable of holding nutrients and moisture.

The other soil types differ in their characteristics: sandy soils have larger pore spaces, which promote quick drainage but can struggle to retain moisture and nutrients. Clay soils, on the other hand, contain very small particles that create minimal pore space leading to poor drainage but high nutrient retention. Rocky soils consist of larger particles and fragments, which do not provide the same mixture of pore sizes that benefit plant growth.