Final answer:
The term describing the natural addition of soil to a property over time is 'accretion'. This process, which can take thousands to millions of years, occurs through sediment deposition by wind and water, organic matter decomposition from plants, and geological events.
Step-by-step explanation:
The term used to describe the addition of soil to a property over time due to natural causes is accretion. Accretion happens when materials like sediment are naturally deposited, leading to the gradual increase in land area or soil depth. This process can be a result of various factors, such as sediment deposition by wind, water flows, or other geological activities. It is important to understand that soil development is a dynamic process that involves both the addition and loss of materials over time. In some cases, soils can accrue additional layers from plants that shed organic matter, which can then decompose to enrich the soil further. Additionally, geological events such as landslides or glacier movement can also contribute to the accretion of soil in an area. However, it is essential to note that soil formation and development are long-term processes that can take thousands to millions of years.