What does 'OL' stand for in soil classification?

• A. Organic silt-clay of low plasticity
• B. Silt with low plasticity
• C. Clay with low plasticity
• D. Plastic silts

Answer: (A)

The term 'OL' in soil classification specifically stands for "Organic silt-clay of low plasticity." This classification is part of the Unified Soil Classification System (USCS), which categorizes soils based on their physical and engineering properties. Organic materials in soil can affect its behavior and properties, such as strength, compressibility, and permeability.

In the case of 'OL', the designation highlights the soil's organic content combined with its particle size and plasticity characteristics. Being classified as "low plasticity" indicates that the soil will not deform significantly under stress compared to soils with higher plasticity. Understanding this classification is essential for engineers and geologists when assessing soil behavior in construction projects or environmental studies.

The other options focus on different aspects of soil classification but do not accurately represent what 'OL' specifically defines in the context of organic soil properties.