oh i have written cars for question 38!31. statue( what was the question?)
32. farm (in the US ,disused equipment )
33. quality (poorer quality of copper)
34. economic/economics/economies (related to growing economies in some countries)
35. electronics (the major contributor to waste metal)
36. Cotton factories ( what was the question?)
37. pipes (underground pipes)
38. plants (platinum can be found in plants by the roads)
39. magnet ( what was the question?)
need those 3 missing questions.