Which of these is the best indication of the relative age of a rock layer?

Why is the "Law of Superposition" critical to the study of fossil life forms?

Rock layers tell a story about their past. What is the basic assumption that is made when reading the story?

In an undisturbed rock profile, the oldest rocks are found

A fossil shell contain 25% of the original amount of its carbon-14. Approximately how many years ago was this shell part of a living organism?

Which statement can best be supported by the fossil record?

The absolute age of a rock is the approximate number of years ago that the rock formed. The absolute age of an igneous rock can best be determined by

Which radioactive substance has the longest half-life?

Which radioactive isotope would be used to determine the age of a wooly mammoth found in Pleistocene sediments?

One similarity between Carbon-14 and Uranium 238 is that both

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