There is a need to break up the hard crust on the surface of the earth to prevent drying out of the lower layers of the soil; small cracks and pores form on the crust, through which moisture evaporates from the lower layers of the soil. When the top layer of the earth is loosened, cracks and pores are destroyed, and moisture in the lower layers remains.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.