I was asked recently to write a short essay on environmentalism to be published in a book on âKey Concepts in Critical Management Studiesâ to be published by Sage later in 2010. I hope itâs useful for those who want a little bit of history and critical understanding of environmentalist as a concept and a movement.
Hand sorting the 1982 Copper from the Zinc pennies. 1982 was the transition year for the US Mint to stop making pennies from copper and switch to zinc. There... Hand sorting the 1982 Copper from the Zinc pennies. 1982 was the transition year for the US Mint to stop making pennies from copper and switch to zinc. There are sorting machines that can be purchased to do this work, but if you dont have a machine, your ears can do the job!
Since it resists corrosion from the air, moisture and seawater, copper has been widely used in coins. Although once made nearly entirely from copper, American pennies are now made from zinc that has been coated with copper. Copper is also used to make water pipes and jewelry, as well as other items. Pure copper is usually too soft for most uses. People first learned about 5,000 years ago that copper can be strengthened if it is mixed with other metals. The two most familiar alloys of copper are bronze and brass.