The atmospheres of the giant planets are very dense and extended, they consist of hydrogen, helium, small amounts of methane, ammonia and other hydrocarbons. The terrestrial planets have a dense and extended atmosphere only for Venus. The main gases are carbon dioxide, nitrogen, argon, and oxygen in the Earth’s atmosphere. Mercury has almost no atmosphere.
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.