If you were absent last class you missed a test and Notebook check. Isostasy Isostasy-The balance between thepull 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 If the mass of the crust decreases, it rises.
Erosion of mountains, melting of glaciers. Stress Stress-The squeezing, stretching and twisting of the Earths crust. Types of stress: Compression-Pushing together Tension-Pulling apart Shearing- sliding in opposite directions Folds Folds-bend in rock layers.
Happen below the crust where it is experiencing stress. Anticline-folds upwards. Oldest rock is in the center of the fold. Syncline-folds downwards
Syncline-folds downwards. The youngest layer is in the center of the fold. Label the picture 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 Types of Faults Normal Fault-hanging wall moves down, footwall moves up. Caused by tension stress What type of plate boundary would thismost likely occur at? 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? 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 thismost likely occur at? Label the 3 pictures with the type of fault they are. How Mountains Form Mountain Range-A group of mountains that are close together and formed together. Ex. Rocky Mountains Mountain System-A group of mountain ranges that are close to each other. Ex: The Appalachian Mountain system.