What is the uniqueness of our planet?

On planet Earth, substances exist in three states – solid, liquid, and gaseous. There is an alternation of land and water. The uniqueness of the planet is due to the existence of life.

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.