21.The stereotypical gold rush prospector panning for gold in a streambed is an example of exploiting deposits. a.magmaticc. residual mineralb. placerd. sedimentaryANS: BDIF:EasyREF:15.3TOP:3

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Geologists know that potassium-40 decays to argon-40, with a half-life of 1.3 billion years. if an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite