What is the primary composition of organic solids?

• A. Sand and gravel
• B. High natural organic content
• C. Clay and silt
• D. Water and minerals

Answer: (B)

The primary composition of organic solids is characterized by a high natural organic content. Organic solids consist mainly of decomposed plant and animal material, which contributes to their rich content of organic matter. This organic matter is crucial for soil fertility as it improves soil structure, enhances water retention, and provides essential nutrients for plant growth.

In contrast, options like sand and gravel, clay and silt, as well as water and minerals primarily describe inorganic components found in soils. While they are important classes of soil materials, they do not represent the organic nature captured in organic solids. Therefore, the emphasis on high natural organic content uniquely defines organic solids, distinguishing them from the other materials listed.