Sandy, platt, crumbly, and blocky are names used to describe soil __________.

The correct choice is that Sandy, platt, crumbly, and blocky describe soil structure. Soil structure refers to the arrangement and organization of soil particles into aggregates, which influence how soil holds water, air, and nutrients. These terms reflect the physical formation of soil aggregates and their shapes, which can be important for understanding how plants root in the soil, how water moves through it, and how soil interacts with environmental factors.

The other options do not fit the context: Color refers to the hue of the soil, which can indicate organic matter content or mineral composition, but doesn't describe its physical arrangement. Texture relates to the size of the soil particles (sand, silt, clay), which affects drainage and nutrient retention but is distinct from how those particles are organized. Moisture pertains to the water content within the soil, an entirely different soil property. Thus, recognizing that Sandy, platt, crumbly, and blocky describe the structural characteristics of soil helps in effectively managing soil health and plant growth.