Which of the following is NOT a common layer of soil in construction?

In construction, common layers of soil typically include clay, silt, and sand, all of which are types of soil or sediment found in a variety of geological and environmental contexts. Clay is known for its fine particles and plasticity when wet, while silt consists of slightly larger particles that retain moisture well but do not compact as tightly as clay. Sand consists of larger, coarse particles that provide excellent drainage and stability, making it ideal for various construction applications.

Granite, on the other hand, is not a soil but rather a type of igneous rock. It is made up of minerals such as quartz, feldspar, and mica, and it provides a solid, stable foundation in certain contexts, but it does not function as a soil layer in the same way that the other materials listed do. In construction, while granite might be used as a building material or for foundational support, it does not represent a layer of soil that would be commonly considered in grading or excavating processes. Thus, it is accurate to say that granite is not a common layer of soil in construction.