Soil is a complex mixture of different materials that provide the necessary support and nutrients for plant growth. In addition to rock particles, which are the main component of soil, there are several other important components that contribute to its composition. These components include minerals, organic matter, air, and water.

1. Minerals:
Minerals are naturally occurring inorganic substances that are derived from rocks and minerals present in the parent material. These minerals provide essential nutrients for plant growth. Examples of minerals commonly found in soil include calcium, potassium, phosphorus, and iron.

2. Organic matter:
Organic matter refers to the decomposed remains of plants, animals, and microorganisms present in the soil. It is a vital component of soil as it improves its fertility, structure, and water-holding capacity. Organic matter also provides nutrients to plants and serves as a food source for beneficial soil organisms. It can be in the form of humus, which is a dark, crumbly substance that gives soil its dark color.

3. Air:
Air is an important component of soil as it provides oxygen necessary for the respiration of plant roots and soil organisms. It also helps in the decomposition of organic matter and the release of carbon dioxide. Air-filled pores in the soil allow for the movement of gases, ensuring a healthy soil environment.

4. Water:
Water is essential for plant growth and is a crucial component of soil. It provides the medium for nutrient uptake by plant roots and helps transport nutrients throughout the plant. Water also acts as a solvent, facilitating chemical reactions that release nutrients from minerals and organic matter. Soil particles hold water, and the availability of water in soil is important for plant growth.

In summary, in addition to rock particles, soil contains minerals, organic matter, air, and water. These components work together to create a fertile and supportive environment for plant growth.