Geologic time Crossword
This printable crossword puzzle on the topic of Rocks & Minerals has 10 clues. Answers range from 3 to 17 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.
Description
Largest unit on geologic time scale.
Rocks placed in order of events known as
Divided into shorter units called periods.
Using carbon to determine age is called
Finding the age of rocks containing radioactive isotope is called
Traces of an organism from geologic past is called
Fossil associated with particular span of geologic time
Subdivision of a period
Division of Earths history into blocks of time
Time required for one-half of atoms of a radioactive substance to decay
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