Georgia Septic Installer Practice Test

Which sequence correctly orders course soils to finer grained soils?

1. sandy loam > silt > clay > fine sand

2. course sand > fine sand > sandy loam > silt > silt clay > clay

3. clay > silt > sand > sandy loam

4. silt > course sand > clay > fine sand

The correct answer is: course sand > fine sand > sandy loam > silt > silt clay > clay

The correct sequence that orders coarse soils to finer-grained soils is based on the texture and particle size of the soil classifications. Coarse soils have larger particles, while finer soils consist of smaller particles. In the correct choice, the sequence begins with coarse sand, which has the largest particle size among the options listed. As you progress through the list, the next is fine sand, which has a smaller particle size compared to coarse sand. Following that is sandy loam, which is a mixture that includes sand but also finer particles, leading into silt, which has even smaller particle sizes. Silt clay comes next, indicating a mixture of silt and clay particles, and finally, clay represents the finest of the soils, with very small particles. The overall arrangement from coarsest to finest is crucial because it affects water drainage, nutrient retention, and the suitability of soil for different types of plant growth. This sequence is a standard understanding in soil science and essential knowledge for septic installers, as the soil type can influence the design and function of septic systems.