Geological Time Scale

Review of the Geological Time Scale

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Across 2. weathered rock particles 4. breakdown of a radioactive element 8. subdivisions of time in earth's history 9. the period when mammals first appear 11. the period known as the age of the dinosaurs 13. wide spread flooding and mass extinctions occur 14. period when the ice age begins and ends 15. change over time 16. evidence of once living things 17. fossils of organisms that lived during a short period of time 18. trilobites important fossils in this era 19. method of determining the age of a fossil

Down 1. era known as the period of many changes 3. the first period in the era known as the age of mammals 5. time periods in Earth's history broken into four segments 6. mutation that occurs that helps a species to survive 7. sediments that show one year 10. era known as the dawn of life 12. law that states younger rocks are found on top of older rocks 13. era divided into two great periods

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