Over the years, rocks are broken and worn away by the forces of nature and become fine. Sand in a sandbox, for example, was originally a rock, but was then ground into smaller pieces.
However, no matter how fine a rock becomes, it does not become soil by itself. In order to become soil, the rock needs the power of living organisms.
Bacteria can live on the fine rock, moss can grow on it, and dead animals and plants can accumulate on it. The sand is then gradually transformed into soil.
The soil thus created contains nutrients. Flowers and trees grow with this nourishment.

Sand scraped from rock is composed purely of minerals. Bacteria, lichens, mosses, and other organisms settle there. Next, decomposition of dead organisms leads to the accumulation of organic matter and humus. Then, through the action of water, air, and other elements, a complex mixture of mineral and organic matter is formed. This is soil, or dirt.