If we dig a hole in ground near a water body, the soil becomes moist. Because the ground water accumulated inside the ground provide moisture to the soil.
The soil cannot be find oily because oil is found in few regions and found deep inside the earth.
The soil cannot be find red as red soil is formed by crystalline rocks and these rocks are found very rarely.
Groundwater gets recharged by this process of infiltration.
Infiltration is the process by which precipitation or the bulk of rainwater and melted snow soaks into subsurface soils and moves into rocks through cracks and pore spaces. so when the water soaks into the ground the groundwater gets recharged.