If a soil forms a ribbon greater than 2 inches, and neither smooth or gritty consistency predominates, the soil is _______, class _____.

When determining the classification of soil based on ribbon formation and consistency, a ribbon that exceeds 2 inches indicates that the soil has a high clay content. The significance of the consistency lies in the characteristics of the soil grains. If neither a smooth nor gritty consistency predominates, it suggests that the soil likely contains a significant amount of clay without the predominant influences of sand or silt that would alter its classification towards a loam or sandy texture.

In this context, a clay classification aligns perfectly with the characteristics described. Soil classified as clay has the plasticity and cohesiveness to form long ribbons, and the lack of smoothness or grittiness further emphasizes that it is primarily clay-based, validating the classification.

The classification system that assigns it to class IV also reflects the characteristics of the soil, which typically indicates a greater prevalence of clay properties. This classification is essential in understanding how the soil will behave in engineering projects, agriculture, and environmental studies, as it impacts drainage capabilities, compaction, and other key factors.