Tectonic Plate Theory & Boundaries

By: Tania galvan

Tectonics plates theory

The Tectonics plates is a theory that earths outer shell is divided into several plates that are over the mantle. This outer layer is called the lithosphere. This has been connected with many other theories that are all geologic features that are driven by relative motion of these tectonic plates.

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Convergent Boundaries

Convergent Boundaries are known as a destructive plate boundary because of subduction which is two or more tectonic plates of the lithosphere were they move toward one another and collide. In a subduction zone, the subducting plate which is normally a plate with oceanic crust moves beneath the other plate and this can normally oceanic or continental crust. Folded mountains are formed when two tectonic plates move together which is convergent boundaries. When two plates move towards one another they form a subduction zone or a continental collision. When a convergent boundary is between two oceanic plates, one is usually subducted under the other and in a trench is formed. Over time, layer upon layer of lava and ash build volcanic mountain ranges above. The Himalayan mountain range demonstrates one of the most visible and one that was had more consequences of plate tectonics. The Andes are the result of plate tectonics processes which are caused by the subduction of the Nazca plate beneath the South American plate. The Marianna's trench was formed at a convergent plate boundary because of plate tectonics or the movement of plates beneath the earths surface which caused the mariana trench to be formed. The ring of fire is located at the borders of the Pacific Plate and other tectonic plates. Around the Ring of Fire the Pacific Plate is colliding with and sliding underneath other plates. The movement of these plates causes volcanoes and earthquakes.
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Divergent Boundaries

Divergent Boundaries is place where two plates move apart which is called a divergent boundary . Most divergent boundaries happen along the mid-ocean ridges where sea-floor spreading occurs. Divergent boundaries also occur on land. When a divergent boundary develops on land, two of Earth’s plates slide apart. A deep valley called a rift valley forms along the divergent boundary. For example the Great Rift Valley in East Africa marks a deep crack in the African continent. Mid-ocean ridges are largely underwater mountain ranges that are present beneath many seas of the world. Mid-ocean ridges are topographic features found where divergent tectonic plate processes are moving two pieces of oceanic crust away from each other. Divergent boundaries caused by the biosphere also create rift valleys on the lithosphere. Iceland is on top of a divergent boundary and it is causing it to slowly move apart. Atlantic Ridge and the East pacific ride and in the continental lithosphere by rift valleys such as the East African Great rift valley. Divergent boundaries can create massive fault zones in the oceanic ridge system. The Mid Atlantic ridge is a mid ocean ridge, a divergent tectonic plate or constructive plate boundary located along the floor of the Atlantic ocean and part of the longest mountain Range in the world
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Transform Boundary

Places where plates slide past each other are called transform boundaries. Since the plates on either side of a transform boundary are merely sliding past each other and not tearing or crunching each other. Transform Boundary are not marked by surface features, their sliding motion causes lots of earthquakes. The strongest and most famous earthquake along the San Andreas fault hit San Francisco in 1906. The California fault is slowly moving north relative to the rest of California. Since motion along the fault is sideways and not vertical, Los Angeles will not crack off and fall into the ocean as popularly but it will simply go towards San Francisco at about 6 centimeters per year.
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