What is the difference between air-ground and water?

1) There is more oxygen in the airborne environment,
2) temperature fluctuations can occur in it over a wide range,
3) it has less density and more light.

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.