The following items can be considered as something that producers can offer to compete for more customers: Better Customer Service. The good you are to deal with your customers the more they will go back to you. Better Product Quality. Customers want the best for themselves and the producers are looking at what is best for their customers.
Temperature and density increases from the crust to the core.
As I said in your other post/question on the same topic, you have to rephrase your question in order for us to help you. =)
EPA is the answer. They keep track of everything.
