1. If you were absent last class you missed a test and Notebook check.

2. Isostasy
Isostasy-The balance between the pull of gravity on the lithosphere and the push of the asthenosphere.
If the mass of the crust increases, it sinks.
New mountains, glaciers, sediment deposition

3. If the mass of the crust decreases, it rises.
Erosion of mountains, melting of glaciers.

4. Stress
Stress-The squeezing, stretching and twisting of the Earth’s crust.
Types of stress:
Compression-Pushing together  
Tension-Pulling apart  
Shearing- sliding in opposite directions  

5. Folds Folds-bend in rock layers.
Happen below the crust where it is experiencing stress.

6. Anticline-folds upwards. Oldest rock is in the center of the fold.

7. Syncline-folds downwards
Syncline-folds downwards. The youngest layer is in the center of the fold.

8. Label the picture

9. Fault-a break in rock in which there is movement.
Hanging wall-The rock above the fault.
Foot wall-The rock below the fault.
Label the picture

10. Types of Faults
Normal Fault-hanging wall moves down, footwall moves up.
Caused by tension stress What type of plate boundary would this most likely occur at?

11. Back of the page.
Reverse Fault-hanging wall moves up, footwall move down.
Caused by compression stress
What type of plate boundary would this most likely occur at?

12. Caused by shearing stress.
Strike Slip Fault-rock on either side of the fault slides horizontally past each other in opposite directions.
Caused by shearing stress.
What type of plate boundary would this most likely occur at?

13. Label the 3 pictures with the type of fault they are.

14. How Mountains Form
Mountain Range-A group of mountains that are close together and formed together. Ex. Rocky Mountains

15. Mountain System-A group of mountain ranges that are close to each other. Ex: The Appalachian Mountain system.