What causes land to be formed by the natural deposit of soil and rock?

The correct answer is accretion, which refers to the natural process through which land is formed by the gradual deposition of soil and rock material, typically by the action of water. This occurs in environments such as riverbanks, deltas, and shorelines where sediment carried by water is deposited over time, building up land. Accretion can significantly expand land areas, creating new habitats and property boundaries.

In contrast, erosion involves the wearing away of land and soil by natural forces like water and wind, which does not create new land but rather reduces existing land mass. Reliction is the process of land being exposed when water recedes, while avulsion refers to a sudden change in land caused by natural events, such as flooding or landslides, which can alter property boundaries but does not relate to the gradual accumulation of soil and rock. Thus, accretion is the only term that specifically indicates the creation of land through the buildup of sediment, making it the correct answer in this context.