What is considered the primary building block of the soil that plants derive nutrients from?

The primary building block of the soil that plants derive nutrients from is organic matter. Organic matter is made up of decomposed plant and animal materials, including leaves, stems, roots, and various organisms. This component of soil is crucial because it enriches the soil with essential nutrients that are vital for plant growth, enhancing the soil's capacity to hold moisture and improve its structure.

Additionally, organic matter plays a significant role in the formation of soil aggregates, which helps create spaces for air and water movement, promoting a healthy environment for root development. It also stimulates microbial activity, which further assists in nutrient cycling.

In contrast, while minerals are essential for nutrients, they primarily contribute to the inorganic portion of soil, and their availability is influenced by the presence of organic matter. Water and air are important for plant health but do not serve as building blocks from which nutrients are derived.