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Plate Boundaries

Plate Boundaries. Earth Science Mr. Barry. Plate Boundaries. Recall: all of the plates that make up the surface of the Earth are moving What happens when these plates meet? 1. Stress is the forces that push and pull on the Earth’s surface.

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Plate Boundaries

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  1. Plate Boundaries Earth Science Mr. Barry

  2. Plate Boundaries Recall: all of the plates that make up the surface of the Earth are moving What happens when these plates meet? 1. Stressis the forces that push and pull on the Earth’s surface. 2. As rock of the crust undergo stress, the change shape and volume. Also, they move up and down. 3. Deformation is the breaking, tilting and folding of rocks.

  3. Types of Stress • There are three kinds of stress that act on Earth’s rocks: • 1. Compression is stress that squeezes rocks together. • 2. Tension is stress that pulls a material apart • 3. Shearing is stress that twists rock in two different directions, causing it to twist

  4. Types of Stress on Land

  5. Cracks in the Rocks A fracture is a crack in a rock usually caused by one of the three stresses A fault is the fracture or system of fractures along which movement occurs The hanging wall is the block of rock above the fault The foot wall is the block of rock below the fault

  6. Hanging Walls and Foot Walls

  7. Types of Faults A normal fault is when the hanging wall moves down relative to the foot wall. This is due to tension and happens at divergent boundaries

  8. Types of Faults A reverse fault is when the hanging wall moves up, relative to the foot wall. This is due to compression and happens along a convergent boundary

  9. Types of Faults A strike-slip fault is when shearing causes the rocks to slide past one another horizontally. This is due to shearing and happens along transform boundaries

  10. Folds • A fold is a bend in a rock. There are two types: • An anticlineis an upward fold • A synclineis a downward fold

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