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Rock under Stress Honey pearl.pptx
- 1.
- 2. Rocks and largemasses undergo deformation wherein it changes their shape, location, size, tilt or break due to squeezing or shearing.
- 3. When the rocksor plates are pulled or pushed together, stress may occur. Not only human can experience stress, rocks also experienced different kinds of stress. In earth sciences and geology, stress is the force per unit area that is placed on a rock.
- 4. There are threemain types of stress, namely, Tension, Compression, and Shear.
- 5.
- 6. Tensional Stress Tensional stresscauses rocks to be pulled apart that result to lengthening and break apart. This type of stress can be found at divergent plate boundaries.
- 7.
- 8.
- 9. Compressional stress causesrocks to fold or fracture. It squeezes rocks together. Compression is the most common type of stress in convergent plate boundaries. Compressional Stress
- 10. Compression pushes rocktogether Compressional Stress
- 11.
- 12. Shear stress happenswhen forces slide pass each other in opposite direction which results to slippage and translation. This is the most common stress found in transform plate boundaries. Shear Stress
- 13. Shear Stress Shearing cancause masses of rocks to slip
- 14.
- 15. 1. Faults –A rock under ample stress can crack, or fracture. The fracture is called a joint because there is a block of rock left standing on either side of a fracture line.
- 16. The footwall isthe rock that place on top the fault, while the hanging wall is below the fault. Hanging wall Footwall
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- 18. Common type offault found in divergent boundaries. A type of fault in which the hanging wall moves down relative to the footwall, and the fault surface dips steeply.
- 19.
- 20. Reverse faults –This type of fault is most common at the convergent boundaries. It forms when the hanging wall moves up. It creates the world’s highest mountain ranges such as Himalayas Mountains and Rocky Mountains.
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- 22. Strike-slip faults –This type of faults formed when the walls move sideways. Usually has no hanging wall and footwall. It can be either right lateral or left lateral. It is mostly common on transform plate boundaries. The most popular example of this type is San Andreas Fault.
- 23. 1. Folds–formed whenrocks experienced compressive stress and deformed plastically. It causes bending of rocks.
- 24. There are threetypes of folds: monoclines, anticlines and synclines. A monocline is a simple bend in the rock layers where the oldest rocks are at the bottom and the youngest are at the top. An anticline is a fold that arches upward where the oldest rocks are found at the center of an anticline. The youngest rocks are covered over them at the top of the structure. A syncline is a fold that bends downward which rocks are curved down to a center.
- 25. A picture isworth a thousand words