Across
- 5. a type of front in which cold air replaces warm air
- 7. ____ boundary is where two plates move away from each other
- 8. a disturbance that travels through a medium from one location to another location
- 9. ____ boundary where two plates move towards each other
- 11. a type of front in which warm air replaces cold air
- 12. is the number of waves that pass a point in a certain period of time
- 13. theory of _______ ______ in which the earth is broken up into plates that move slowly over time
Down
- 1. a method for determining age of rocks without knowing their specific age
- 2. a method for determining exact age of rocks
- 3. the remains or impression of an organism found within a rock
- 4. the process by which organisms change in order to fit their environment better
- 6. a substance that has mass and takes up space2. ____ boundary where two plates slide against each other
- 10. the process by which organisms change through time