What aspect of soil assessment is not included in visual analysis?

Quantitative analysis is not included in visual analysis of soil assessment because visual analysis primarily relies on observable characteristics such as color, texture, structure, and the presence of vegetation or other surface indicators. These observations provide qualitative information about the soil, which can help in understanding its general condition and suitability for various uses, such as construction or agriculture.

Visual analysis does not involve measuring specific quantities or numerical data; for example, it doesn't quantify soil pH levels, nutrient content, or moisture levels, which are aspects typically assessed through more detailed testing methodologies. Therefore, while you can gather a lot of useful information from a visual assessment, the more detailed numerical data that would classify as quantitative analysis is beyond its scope.

In contrast, qualitative information relating to soil is indeed a focus of visual analysis, as are surface water observation and the visibility of any underground structures when they might be apparent.