Across
- 5. the process of determining if one rock or geologic event is older or younger than another
- 6. the act of intruding or the state of being intruded
- 8. if a fault or other body of rock cuts through another body of rock then it must be younger in age than the rock through which it cuts and displaces
- 14. calculates an age in years for geologic materials
- 15. the weather conditions prevailing in an area in general or over a long period.
- 17. periods of glacials and interglacials
- 18. the “calendar” for events in Earth history
Down
- 1. the action of placing one thing on or above another, especially so that they coincide.
- 2. changes the earth over time
- 3. the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
- 4. process used to create objects of a fixed cross-sectional profile by pushing material through a die of the desired cross-section
- 7. the process by which an unstable atomic nucleus loses energy by radiation
- 9. a fracture or zone of fractures between two blocks of rock
- 10. fossil of a footprint or trail
- 11. a columnar diagram that shows the rock formations of a locality or region
- 12. a surface of contact between two groups of unconformable strata.
- 13. the time taken for the radioactivity of a specified isotope to fall to half its original value
- 16. the process of determining an age on a specified chronology in archaeology and geology