Earth's Early History Crossword

This printable crossword puzzle on the topic of Rocks & Minerals has 10 clues. Answers range from 4 to 17 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

the idea that the physical,chemical and biological laws that operate now operated in the past
method that geologists use to place rocks in chronological order
Pieces of one rock unit that are contained within another rock unit
Dying out
Preserved remains or traces of an organism
Change over time
Beneficial traits for surving
the process by which atoms decay
the largest intervals of geologic time
periods are divided into these smaller units