Which elements are more common in the universe – those that are lighter than iron, or those that are heavier? Explain why.

The more common are those elements that are lighter than iron. They are formed from primary hydrogen over a long period of time inside massive stars. Elements heavier than iron are formed in short time intervals by supernova explosions.

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.