1. Copper is a natural element found ______ the Earth's crust. in
a) on
b) in

2. Copper has the chemical symbol ______. Cu
a) Co
b) Cu

3. Copper is a reddish-brown ______. metal
a) metal
b) liquid

4. Copper is an excellent conductor ______ electricity. of
a) for
b) of

5. Copper oxidizes, forming a green ______. patina
a) patina
b) film

6. The Statue of Liberty is made ______ copper. of
a) with
b) of

7. Copper is used in electrical ______. wiring
a) wiring
b) plates

8. Copper pipes are common ______ plumbing. in
a) on
b) in

9. Copper roofs can last ______ 100 years. over
a) over
b) under

10. Chile is the largest ______ of copper. producer
a) miner
b) producer

11. Copper is resistant ______ rust. to
a) for
b) to

12. Copper pipes are safe ______ drinking water. for
a) for
b) to

13. Copper is used ______ renewable energy systems. in
a) in
b) on

14. Copper roofs are common ______ historical buildings. on
a) in
b) on

15. The Statue of Liberty has a green color ______ oxidation. from
a) from
b) by

16. Copper is malleable, so it can be shaped ______ easily. very
a) very
b) more

17. Copper wiring is common ______ modern homes. in
a) in
b) at

18. Recycling copper saves energy compared ______ mining. to
a) with
b) to

19. Copper compounds like bronze are used ______ machinery. in
a) in
b) on

20. Copper has been used by humans ______ thousands of years. for
a) since
b) for

21. Copper is antimicrobial and kills bacteria ______ its surface. on
a) on
b) in

22. Copper compounds are often green or ______ blue. blue
a) red
b) blue

23. Copper roofs can last ______ 100 years. over
a) under
b) over

24. The Statue of Liberty is made ______ copper. of
a) of
b) in

25. Copper is a soft metal that can be bent ______ easily. very
a) more
b) very

26. Bronze is a mix of copper ______ tin. and
a) or
b) and

27. Brass is a mix of copper ______ zinc. and
a) and
b) or

28. Copper pipes are commonly used ______ plumbing systems. in
a) on
b) in

29. Chile is the largest producer ______ copper in the world. of
a) of
b) for

30. Copper can oxidize, forming a green patina ______ its surface. on
a) on
b) in

31. Copper wiring is commonly found ______ modern homes. in
a) in
b) on

32. Copper is malleable, meaning it can be shaped ______ easily. very
a) very
b) less

33. Recycling copper saves energy compared ______ mining new copper. to
a) for
b) to

34. Copper compounds are used ______ industrial applications. in
a) in
b) on

35. Copper has been used by humans ______ thousands of years. for
a) since
b) for

36. Copper roofs are commonly found ______ historical buildings. on
a) in
b) on

37. Copper is essential ______ renewable energy systems. to
a) to
b) for

38. Copper pipes are used ______ carrying hot and cold water. for
a) in
b) for

39. Copper is a key material ______ electrical wiring. in
a) for
b) in

40. The chemical symbol for copper is ______. Cu
a) Cu
b) Co

41. Copper is resistant ______ rust. to
a) in
b) to

42. Copper pipes last ______ a lifetime. for
a) for
b) in

43. Copper is found ______ nature in its pure form. in
a) on
b) in

44. The melting point of copper is ______ 1085°C. around
a) over
b) around