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Text File  |  1992-09-03  |  466b  |  13 lines
  1. The science of determining the age of
  2. geological structures, rocks, and fossils,
  3. and placing them in the context of geological
  4. time. Dating can be carried out by
  5. identifying fossils of creatures that lived
  6. only at certain times (marker fossils), by
  7. looking at the physical relationships of
  8. rocks to other rocks of a known age, or by
  9. measuring how much of a rock's radioactive
  10. elements have changed since the rock was
  11. formed, using the process of radiometric
  12. dating.
  13.