Earth History Crossword

This printable crossword puzzle on the topic of Rocks & Minerals has 16 clues. Answers range from 3 to 15 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

A disturbance in one or more layers of the Earth's crust
A process that breaks rocks down
Natural differences
A group of an organism tha share most of the same characteristics
Weathered rock and other materials deposited by water, wind or ice
A taxonomic group made up of related classes
Rock that forms under extreme heat, pressure or both
Melted rock
Rock that is formed from magma that has cooled and hardened
The study of Earth's history, processes, and structures
The evidence of an organism that lived in past ages
No longer found on Earth
How an organism changes over time
A division of an eon on the geologic time scale
The shortest division of the geologic time scale
The longest unit on the geologic time scale