Multiple MatchingExercise 2 of 68

Copper was among the very first metals our ancestors learned to shape, hammered into tools and ornaments thousands of years ago. Its great modern value lies elsewhere: it runs through the wiring of nearly every home, carrying power from room to room. Left out in the open air, its warm reddish surface slowly turns a…

• Which metal is used for the electrical wiring in most homes?
• Which metal did humans learn to use earliest?