Age Vocabulary Crossword

This printable crossword puzzle on the topic of Rocks & Minerals has 10 clues. Answers range from 6 to 22 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

A rocks age in specific years.
Present over large regions, distinguishable features, lived over a short time, occur in fairly large numbers.
Younger rocks are on top, older rocks are on the bottom.
Helps decide which layer is older the the other without saying the rocks age in specific years.
Measures the concentration of the original radioactive isotope and of the newly formed isotope.
Original radioactive isotope
Newly formed isotope
Parent Isotope = C14, Daughter Isotope = N14
How geologists determine absolute age.
How long it takes half of the parent mass to convert to daughter isotope