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History of Earth Crossword

Across
The time required for any specific property to decrease by half
A gap in the geologic record
Younger then the rock below it
THE AGING OF ONE ROCK COMPARED TO ANOTHER
Determine the relative ages of sedimentary rock layer
When the atoms of one element break down to form atoms of another element
Down
Younger then the rocks around it and beneath it
A fossil that is used for dating correlating the strata it is found
The number of years since the rock formed
A break in earths crust