A geologist found 600-year-old sediments below a particular rock layer. Which will the geologist most likely find above the rock layer?

On a geological dig, two fossil samples were found in different rock layers in the same area. One fossil was found in a rock layer that was located below the other.Which can be concluded about the relative ages of the fossils?

Which best describes a fossil that helps determine the relative age of a rock layer?

Which characteristic of carbon-14 dating helps scientists determine the approximate time a species became extinct?

Which makes a good index fossil?

Which isotope has been most often used to determine the age of fossils in the past 50,000 years?

A rock sample has 25% of its original radioactive element and the half-life of the element is 1 million years. How old is the sample?

An undisturbed rock column contains a fossil of a reptile species in the lowest rock layer, an index fossil that was present 1 million years ago in the middle rock layer, and a fossil of a clam species in the top rock layer. Which statement is most l

A scientist finds an index fossil in layers of rock in both Africa and South America. What does this indicate about the ages of the rocks?

Which is the most accurate method used in determining the age of a fossil?

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