Across
- 2. says the bottom layer is oldest in undisturbed layers
- 3. this fizzes with acid
- 7. proof that universe is expanding
- 8. these lines go north-south, but measure east/west
- 11. type of weathering in cold, humid climates
- 13. casued by air pressure differences
- 14. these move the tectonic plates
- 17. type of fossil used to determine age of rock
- 19. type of rock most likely to have fossils
- 20. what ocean crust is made of
- 21. what continental crust is made of
- 23. the faster of the two types of waves
Down
- 1. use this to answer many of the questions
- 4. the closer these are together,the steeper the slope or gradient
- 5. age of universe
- 6. type of weathering in warm, humid climates
- 9. this increases as planets are closer to the sun
- 10. used to date old rocks (with exponent 238)
- 12. number of seisometer stations needed to plot earthquake
- 13. December 21st
- 14. this type of front moves the fastest
- 15. number one agent of erosion
- 16. galaxy we live in
- 18. proof of this is cosmic background radiation
- 22. used to date recent living things (with exponent 14)