What is one advantage using isochrons with Pb/Pb ratios instead of just picking one of the U-Pb systems?

3

explanation:

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

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6.4 cm (max) - 25 cm (min)