Core & Ext. Metals: Extraction
Slide 4 of 45
Human discovery of metals
Approximate dates
•Copper
•for weapons & jewellery
gold                          and silver
used for jewellery – why?
not for weapons - why not?
Since 6000  B.C.
(long before grandma)
Since 4000 B.C.
 tin
Since 1500 B.C.
(way before Mum & Dad)