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Chapter 15.4 Deforming the Earth’s Crust

Chapter 15.4 Deforming the Earth’s Crust. stress. a force that acts on rock deforming it’s shape or volume. YouTube video-Bill Nye Stress. Stress causes rocks to either fold (bend) or fault (break). Folding. Folded Mountains.

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Chapter 15.4 Deforming the Earth’s Crust

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  1. Chapter 15.4Deforming the Earth’s Crust

  2. stress • a force that acts on rock deforming it’s shape or volume

  3. YouTube video-Bill Nye Stress

  4. Stress causes rocks to either fold (bend) or fault (break).

  5. Folding Folded Mountains • fold-bend in rock that forms when compression shortens & thickens part of Earth’s crust –can create folded Mountains

  6. Three Types of Folds • Anticline • Syncline • Monocline

  7. Anticline • foldin rock layers that forms an Arch

  8. Syncline • fold in rock layers that bends down to form a bowl –SMILEY FACE!

  9. Anticline & syncline

  10. Anticline & syncline

  11. Monocline • Rock layers are folded so that both ends of the fold are horizontal.

  12. Hanging Wall/Footwall

  13. Normal fault hanging wall moves down relative to the footwall footwall hanging wall

  14. Normal Faults

  15. Reverse faulthanging wall moves up relative to the footwall footwall hanging wall

  16. Reverse Fault

  17. Strike-Slip Fault • Faulting at a transform boundary – fault blocks slide past each other

  18. What kind of fault is this? strike-slip fault

  19. Example of a strike-slip fault San Andreas fault

  20. Fault-Block Mountains • mountains formed when normal faults cause large blocks of rocks to slip down due to tension Grand Teton mountain range

  21. fault-block mountain

  22. Uplift and Subsidence • Vertical movements in the crust are divided into two types— • Uplift – the rising of regions of the Earth’s crust to higher elevations (mountains and rebound – slow movement back to normal level after weight is removed) • Subsidence – sinking of regions of Earth’s crust to lower elevations (rift zones and oceanic crust as it moves away from the ridge)

  23. plateau= large area of flat land elevated high above sea level (an area of uplift)

  24. The Colorado Plateau is a 150,000 square mile region covering parts of Arizona, Utah, Colorado, and New Mexico.

  25. Let's Review

  26. syncline • What is a fold in rock layers that bends down to form a bowl ? YES NO

  27. syncline NEXT

  28. syncline NEXT

  29. fold What is a bend in rock that forms when compression shortens & thickens part of Earth’s crust ? YES NO

  30. A fold is a bend in rock that forms when compression shortens & thickens part of Earth’s crust. NEXT

  31. A fold is a bend in rock that forms when compression shortens & thickens part of Earth’s crust. NEXT

  32. fault-block mountain • What is a mountain formed when normal faults cause a block of rock to slip down? Sierra-Nevada mountain range YES NO

  33. NEXT

  34. NEXT

  35. anticline • What is a foldin rock layers that forms an arch ? YES NO

  36. NEXT

  37. NEXT

  38. In a _____________ fault, the rocks on either side of the fault slip past each other sideways. YES NO

  39. In a strike-slip fault, the rocks on either side of the fault slip past each other sideways. NEXT

  40. NEXT

  41. shearing tension compression YES NO

  42. The 3 types of stress are shearing, tension and compression. NEXT

  43. The 3 types of stress are shearing, tension and compression. NEXT

  44. tension What type of stress pulls on the crust, stretching the rock so that it becomes thinner in the middle ? YES NO

  45. NEXT

  46. NEXT

  47. B. shearing • What type of stress pushes rock in opposite directions? A. tension YES NO

  48. NEXT

  49. NEXT

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