Remember what an ancient platform is. What structure does it have?

The ancient platform is a stable, rigid section of the earth’s crust with a Precambrian basement composed of ancient igneous crystalline rocks. At the top, the foundation is covered with a sedimentary cover of varying thickness. Areas of the platform where the foundation comes out to the surface are called shields.

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.