Why is the terrain of the Earth constantly changing?

The surface relief is affected by external forces – the flow of water, glaciers, living organisms, temperature changes, wind, as well as internal forces caused by the movement of lithospheric plates

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.