Which of the following statements is correct regarding soil formation?

Soil formation is a complex process that involves the combination of various factors, primarily the weathering of parent rock and the accumulation of organic material. The correct statement emphasizes that both weathered material from rocks and organic matter from decomposed plants and animals play essential roles in creating soil. Weathering breaks down the parent rock into smaller particles, which can include minerals like sand, silt, and clay, while organic matter enriches the soil, providing nutrients necessary for plant growth. This interplay between mineral components and organic contributions adds to the diversity and fertility of the soil.

The other options fail to encompass the full process of soil formation. For instance, stating that soil only forms from organic matter disregards the crucial role that minerals from parent rock play. Similarly, claiming that soil forms solely from clay particles ignores the variety of particle sizes and types that contribute to soil structure. Finally, the idea that soil is immovable once formed conflicts with the understanding that soil can be eroded, transported, or subjected to other physical processes over time. Thus, the correct statement accurately captures the fundamental aspects of soil formation.