Certified Storm Water Operator Practice Exam

What does soil structure describe?

1. The size of soil particles

2. The degree to which individual soil particles adhere to each other

3. The color and composition of soil layers

4. The overall porosity of the soil

The correct answer is: The degree to which individual soil particles adhere to each other

Soil structure primarily refers to the arrangement and organization of soil particles and the spaces between them, which is crucial for understanding how soil functions in terms of water movement, aeration, and root growth. The degree to which individual soil particles adhere to each other defines the formation of aggregates or clumps that make up the soil's architecture. This structural arrangement influences important soil properties such as porosity, permeability, and the ability of soil to support plant life. In contrast, the size of soil particles speaks to texture rather than structure, while the color and composition of soil layers pertain to their chemical and physical characteristics. Overall porosity relates to the volume of pores in the soil rather than the arrangement of the particles themselves. Hence, adherence between soil particles directly relates to the concept of soil structure and its implications for environmental and agricultural practices.