Soil Formation Factors:
Soil formation is a complex process influenced by several factors. These factors interact with each other to determine the characteristics of soil in a particular location.

Parent Rock:
- The parent rock, also known as the bedrock, plays a significant role in soil formation. The composition and structure of the parent rock influence the mineral composition of the soil.

Time:
- Time is another crucial factor in soil formation. It takes thousands to millions of years for soil to develop from parent material through weathering and other processes. The longer the time, the more developed the soil becomes.

Climate:
- Climate, including temperature and precipitation, greatly impacts soil formation. For example, in regions with high rainfall, the soil may be more acidic due to leaching of minerals, while in arid regions, soil may be more alkaline.

Soil Composition:
- Soil composition, which includes the mineral content, organic matter, water, and air, is a result of the interaction between the other factors. While soil composition is not a factor in soil formation itself, it is a reflection of the processes that have occurred during soil formation.
In conclusion, soil composition is not a factor in soil formation but rather a characteristic of the soil that is influenced by the parent rock, time, and climate among other factors.