Across
- 3. The era we currently live in
- 4. Geologic processes today have been occurring since Earth formed
- 8. Matching rocks or fossils to common geographic areas
- 9. Eon where supercontinents formed and broke apart
- 10. Fossil Fossil that is easily recognized and found in many places
- 12. Fossil that is a footprint, trail or trace of an organism
- 16. Time division that is the longest
- 17. Most common type of fossil
- 22. Techniques used to determine the specific age of rocks
- 23. Time division that is the shortest
- 24. Era that is the also known as "The Age of Reptiles"
- 27. Time division that marks a major shift in the types of fossils present
- 28. Older rocks are at the bottom and younger rocks are at the top
- 29. Scientists can use _______________ to determine the absolute age of a rock
- 30. The Paleozoic and Mesozoic Era both ended in this (2 words)
Down
- 1. Eon named after Hades
- 2. The record of Earth's history from its origin to the present
- 5. Era that means "Ancient Life" in Greek
- 6. Fossil that holds an impression of the organism
- 7. Part of the geologic timescale that makes up 90% of Earth's history
- 11. Fossil whose remains have been altered very little since the organism's death
- 13. When an element breaks down
- 14. Pieces in a rock layer must be older than the rock it cuts across
- 15. Father of Modern Geology
- 18. Compares the age of one rock to another
- 19. Eon that began with the formation of Earth's crust
- 20. The eon during which the moon formed
- 21. Era that is also known as "The Age of Mammals"
- 25. Preserved imprints or remains of prehistoric organisms
- 26. Divisions within an era