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Deforming the Earth's Crust

Deforming the Earth's Crust. Deformation. 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

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Deforming the Earth's Crust

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  1. Deforming the Earth's Crust

  2. Deformation • 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

  3. Folding • 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

  4. http://z.about.com/d/geology/1/0/X/L/anticline.jpg www.dcnr.state.pa.us/.../images/syncline.jpg

  5. Faulting • 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

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

  7. www.hp1039.jishin.go.jp/.../figures/af1-2.jpg

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