Passage of minerals from topsoil to subsoil through seepage of water is known as

The passage of minerals from topsoil to subsoil through seepage of water is known as Leaching.
Leaching is the loss of water-soluble plant nutrients from the soil, due to rain and irrigation. Soil structure, crop planting, type and application rates of fertilizers, and other factors are taken into account to avoid excessive nutrient loss.
Leaching is a natural environmental concern when it contributes to groundwater contamination.