system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
How is plastic made?


assistant
Plastic is made from oil, natural gas and even plant oils during refining of these oils into other products like gasoline.  Ethane and propane are created when treated with heat during a refinery process called cracking.  This turns the Ethane and propane into ethylene and propylene which are used with other chemical ingredients to create polymers that are the base of what plastic is made out of.