Below what percentage of rock fragments is considered to have few or no fragments?

The classification of soil with respect to rock fragments is important for understanding soil texture and its implications for various environmental factors, including water retention, drainage, and erosion. When referring to soil that has "few or no fragments," it typically indicates a relatively low percentage of rock fragments present within the soil volume.

In this context, a threshold of 15% rock fragments is established, meaning that if the percentage of rock fragments in the soil is below this level, the soil can generally be considered to have few or no fragments. This classification aligns with standard soil science principles that gauge fragmentation levels in relation to soil behavior and characteristics. Soil with less than 15% rock fragments tends to function more uniformly, as the presence of larger fragments can affect root penetration and water movement differently than finer materials.

Therefore, the percentage of 15% is the critical level in distinguishing soil types based on fragment presence, making it the correct choice in this scenario.