It could have been manufactured from ore from any one of a variety of sources.
It could have been produced by the addition of other metals during the processing of the copper ore.
24. According to the passage, possible sources of the lead found in a copper or bronze artifact include which of the following?
I. The copper ore used to manufacture the artifact
II. Flux added during processing of the copper ore
III. Other metal added during processing of the copper ore
I only
II only
III only
II and III only
I, II, and III
25. The author rejects copper as the ideal choice mentioned in line 33 because
the concentration of copper in Bronze Age artifacts varies
elements other than copper may be introduced during smelting
the isotopic composition of copper changes during smelting
among common copper ores, differences in copper isotope composition are too small
within a single source of copper ore, copper isotope composition can vary substantially
26. The author makes which of the following statements about lead isotope composition?
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