Why are radioactive substances useful for measuring geologic time?

If a radioactive material were cut into pieces, the half-life of each piece would be

If an object is cut in eight equal pieces, what happens to its half life?

Why are radioactive materials useful for measuring geologic time?

Compared to the length of time for the first half-life of a sample of a radioactive isotope, the length of time for the second half-life is

One similarity between uranium-238 and carbon-14 is that both

The half-life of a radioactive substance is mainly controlled by the

Which radioactive isotope is most useful for determining the age of mastodont bones

Which radioactive isotope disintegrates to lead (Pb206)?

Which two elements are most useful for the radioactive dating of recent organic remains?

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