If you can, tell how each plastic looks like.
Thermo Plastics (soften when heated): Polyethylene, Polyvinyl chloride, Polypropylene, Polystyrene, Polyethylene terephalate, Acrylonitrile butadiene styrene, Polymethyl methacrylate, Polyamide. Thermosetting Plastics (release heat as they harden): Polyurethane, Phenolic, Melamine-formaldehyde, Urea-formaldehyde, Polyester, Epoxy. There are the names of 14 plastics I could remember. I have no idea how to figure out which are the six most popular. Perhaps you should do a search on each one, with an additional parameter to narrow the search. For example, Polyethylene+ global-annual-production Don't use the quotation marks; no space before but one space after the plus; no spaces before or after the hyphen. Once you know the global annual production of each type, you could rank them in order and find the most popular types. Why do teachers ask such idiotic questions? They sound so easy, but finding the true facts is always nearly impossible. Why couldn't they just say, Name six common plastics. Oh well, it's your problem, not mine. Oops! Forgot the last part of the question. It is generally impossible to describe the appearance of a particular type of plastic. Their names refer to the chemical structure of their molecules and their appearance depends largely on techniques used during manufacture. Another idiotic teacher question, hopelessly vague and nearly impossible to answer. Again, it's your problem. Bye....................
