It has gone through four half-lives of carbon-14 (5730 years<span> x 4 = </span>22920 years<span>)
It is 22920 years old.
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The answer is B. Mountains.
The deposition of sediment where there is a steep drop-off into shallow, flat land can create an alluvial fan. An alluvial fan is a triangular-shaped deposit of sand, gravel, and small sediments.
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<span>As with igneous and sedimentary rocks, metamorphic rocks are classified on the basis of texture (grain size, shape, orientation) and mineral composition. However, the classifiction of metamorphic rocks is more difficult to get into than with igneousand sedimentary rocks, for a couple of reasons.</span>Oct 25, 2000
A metropolitan area.
Example: New York Metropolitan Area