Stress-the amount of force per unit area on a given material Deformation-the process by which the shape of a rock changes because of stress Compression-when.

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Presentation transcript:

Stress-the amount of force per unit area on a given material Deformation-the process by which the shape of a rock changes because of stress Compression-when two tectonic plates collide and squeeze together Tension-stress that occurs when two forces act to stretch an object

The bending of rock layers because of stress in the Earth’s crust Types of folding Anticlines-upward arching fold Syncline-downward, trough-like fold Monocline-rock layers are folded so that both ends of the fold are horizontal

z.about.com/d/geology/1/0/X/L/anticline.jpg

The surface along which rocks break and slide past each other Normal faults-when rocks are pulled apart because of tension Reverse faults-when rocks are pushed together by compression Strike-slip-form when opposing forces cause rock to break and move horizontally

facweb.bhc.edu/.../Study/Images/NormalFault.gif facweb.bhc.edu/.../study/Images/ReverseFault.gif