Bronze Age .Bronze is a copper-tin alloy .The Bronze Age dates from 3600-1400 B.C. .The Egyptians made bronze objects by a technique called investment casting. .Bronze is much harder and stronger than pure copper. .Bronze does not form much porosity when cast. PDF文件使用"pdfFactory Pro'”试用版本创建wm,fineprint.com,cn Bronze Age •Bronze is a copper-tin alloy. •The Bronze Age dates from 3600-1400 B.C. •The Egyptians made bronze objects by a technique called investment casting. •Bronze is much harder and stronger than pure copper. •Bronze does not form much porosity when cast. PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn