The Cracks Distance property refers to the horizontal spacing between cracks in the soil surface, which can occur due to the shrinkage of soil as it dries. Cracks form when water content decreases, and their distance is an indicator of the soil's shrink-swell behavior. Larger distances between cracks generally indicate more severe soil shrinkage, which can affect root growth and water infiltration. Source: McSweeney, K. (2009). Soil and Water Conservation Handbook. CRC Press.