The following properties are characteristic of the soil: a certain structure, humidity, temperature, aeration (air supply), the reaction of the medium (pH), salinity. The vertical structure of the soil has three main horizons, which vary greatly in chemical composition and physical properties. Soil density increases with depth. Humidity, temperature and soil aeration are closely interconnected and interdependent. The temperature fluctuations in the soil are smoothed in comparison with the surface air and can no longer be traced at a depth of 1-1.5 m. The hydrothermal regime of the soil and its aeration depend on the structure of the soil. Clay soils, in comparison with sand soils, retain moisture more strongly, are aerated worse and warm up worse.
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.