How is radioactive decay used to date sedimentary rocks?
A)The amounts of potassium and argon in sedimentary rocks are measured.
B)The amounts of carbon-14 and nitrogen in sedimentary rocks are measured.
C)The amounts of unstable elements in each layer of the sedimentary rocks are compared.
D)The amounts of unstable elements in the volcanic layers above and below the sedimentary layers are measured.
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Explanation:
Geologists use radiometric dating to estimate how long ago rocks formed, and to infer the ages of fossils contained within those rocks. The universe is full of naturally occurring radioactive elements. Radioactive atoms are inherently unstable; over time, radioactive "parent atoms" decay into stable "daughter atoms."
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Geologists use radiometric dating to estimate how long ago rocks formed , and to infer the ages of fossils contained within those rocks. The universe is full of naturally occurring radioactive elements . Radioactive atoms are inherently unstable ; over time , radioactive " parent atoms " decay into stable " daughter atoms ".
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