Across
- 3. one of 3 types of rocks
- 4. act of introducing
- 6. a long and distinct period of history with a particularfeature how something look that is fractured
- 7. around the year or moth it died
- 9. rock formed from a ssupstance
- 10. diffent perisoes that have differnat animals
Down
- 1. the year or month, it died
- 2. oldest on batlom and youngest on top
- 4. for dating animals to there time
- 5. someone how studies rocks and fossils
- 8. remains of an old animal or plant
- 11. when something starts to detreerat