Across
- 2. a type of rock created by heat and pressure
- 4. gradual changes over time
- 6. fossils that lived in a specific time period that is used to identify the time and rock layer
- 8. when a dead organism decays, it leaves a visible carbon layer behind which are called __
- 12. actual age of an object
- 13. time period in geologic time which is shorter than a period
- 14. minerals pass through and replace organisms cells and turns it into stone
- 17. something happening to a rock that is out of place and breaks the rock pa
- 19. a law that states younger rock lies above older rock
- 23. thickness of some material put on top of a surface or more material
- 24. sediment fills in the mold and turns into rock
- 26. a type of rock where sediment and possibly fossils are packed together and hardens
- 28. a type of rock formed by magma
- 29. a long period of time in geologic time, but shorter than an eon and longer than an epoch
Down
- 1. an estimate of an age compared to another object
- 3. rock layers slant from Earth's forces
- 5. remains of an organism that have not been changed
- 7. magma being forced into rock formations and cools
- 9. half the atoms decaying
- 10. visible shape after an organism has been buried in sediment and decayed away
- 11. rock layers bend
- 15. longest time period in geologic time
- 16. remains of an organism that have been preserved
- 18. time period of the development and formation of the Earth
- 20. time in geologic time where rocks were formed and is longer than an epoch
- 21. evidence of organism activity that has been preserved
- 22. Earth's crust shifts past one another breaking the Earth's crust
- 25. rings found in a tree that accurately show the history of the weather patterns
- 27. a sample that shows the different layers of ice and how the Earth's climate has change over time