Graph showing how the price of zinc have changed over the last ten years. Graph by juk Bhattacharyya, University of Wisconsin-Whitewater, based on data from USGS Mineral Information (http://minerals.usgs.gov/minerals/pubs/commodity/zinc/)
Originally uploaded in Integrate:Teaching for Sustainability:InTeGrate Modules:Humans' Dependence on Earth's Mineral Resources.
Image 43843 is a 720 by 960 pixel JPEG
Uploaded: Mar2 14