A rock sample containing an isotope with a half-life of 12 million years has an initial mass of 72 grams. How much of the daughter isotope will be present after three half-lives?
A)4.5 grams
B)9 grams
C)18 grams
D)54 grams
E)63 grams
E
Environmental & Atmospheric Sciences
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In the figure below, a tectonic terrane is shown at
A. ocean plateau. B. linear island chain. C. continental fragment. D. island arc. E. All of these.
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Briefly describe how the Coriolis effect influences air movement
What will be an ideal response?
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Lead, mercury and plutonium are these that have a tendency to accumulate in organisms.
A. radioactive metals B. heavy metals C. native metals D. precious metals
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