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Plate Boundary Motion and Their Resulting Landforms
Lesson 8: Plate Boundary Motion and Their Resulting Landforms = plates below the oceanic crust Key: = plates that have begun to melt = plates below the continent
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Converging Oceanic Oceanic
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Converging Oceanic Oceanic Oceanic Diverging
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Continental Oceanic Converging Oceanic Oceanic Oceanic Converging Diverging
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Continental Oceanic Continental Continental Converging Oceanic Oceanic Oceanic Converging Diverging Diverging
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Oceanic Continental Continental Continental Oceanic Oceanic Oceanic Converging Diverging Converging Converging Diverging
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Oceanic to oceanic converging plates meet at a convergent boundary
Oceanic to oceanic converging plates meet at a convergent boundary. The more dense plate moves beneath the least dense plate in a process called subduction. The subducting plate melts the upper oceanic crust to form volcanic Island Arches. Oceanic Oceanic Converging
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Oceanic to oceanic diverging plates create the mid ocean ridge at a divergent boundary.
What 3 processes are responsible for sea floor spreading? Oceanic Oceanic Diverging
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This creates coastal mountains, Volcanos and an ocean trenches.
Oceanic Continental Converging Oceanic crust is made of Basalt. Continental crust is granitic (made of silicates). The basalt is more dense than silica, is wet and is colder and so the basalt is pulled under the crust in a process known as subduction. The location that this takes place in is called the subduction zone.
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Diverging continental plates create Rift valleys, fault block mountains and volcanos at the divergent boundary. Continental Continental Diverging
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When two Continental plates collide,
two mountain types form. They are folded mountains and fault-block mountains. Continental Continental Converging
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Lesson 9 : Stresses caused by plate motion and their resulting land forms (a closer look)
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Un-deformed crust crust
Unstressed lithospheric continental plate
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tension divergent boundary tension
When the plates move apart, they thin out at the divergent boundary. This causes the crust above to break and sink lower. This creates a rift valley that is bounded on both sides by fault block mountains and volcanos. tension Tension Tension divergent boundary tension Divergent Plate boundary The type of stress in the plate is called tension (or extension)
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When the plates move together they thicken at the divergent boundary
When the plates move together they thicken at the divergent boundary. This causes the crust above to “wrinkle” or “fold” higher and then break. This creates fault block mountains and folded mountains Tension Divergent Plate boundary convergent boundary Compression Compression The type of stress in the plate is called compression
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