An Archaeological Sample Contains 0 $\times$ 10^-10/year $\times$ 10⁹ Years
B)8 $\times$ 10⁸ Years
C)2

question 7

Multiple Choice

An archaeological sample contains 0.739 g of lead-206 and 2.328 g of uranium-238.Assume that all the lead now present in the rock came from the radioactive decay of the uranium and that no appreciable amounts of other radioactive nuclides are present in the sample.The decay rate constant for the uranium is 1.54 $\times$ 10^-10/year.What is the age of the sample?

• A)8.54 \(\times\) 10⁹ years
• B)8.81 \(\times\) 10⁸ years
• C)2.03 \(\times\) 10⁹ years
• D)6.51 \(\times\) 10⁹ years
• E)none of these

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Definitions:

Asthenosphere

The semi-fluid layer of the Earth's mantle beneath the lithosphere that allows for the movement of tectonic plates.

Lithosphere

The rigid outer layer of the Earth, including the crust and upper mantle, involved in plate tectonics and continental drift.

Topographic Profile

A cross-sectional view of a portion of Earth's surface, showing elevation, relief, and slope of the terrain along a specific line.

Thinnest Crust

The portion of the Earth's crust that is found underneath the oceans, measuring about 5 to 10 kilometers in thickness, which is thinner than continental crust.