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| is a linear feature that exists between two tectonic plates that are moving away from each other. |
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| is when the sea floor extends when two plates move apart. this causes earth quakes. |
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| mid-ocean ridge is a term for an under water mountain system that has of various mountain ranges ,typically having a vallley known as a rift running along its spine, formed by plate tectonics |
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| island arcs are formed as one oceanic tectonic plate subducts another one and, produces magma at depth below the colliding plate |
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| is an actively deforming region where two (or more) tectonic plates or fragments of lithosphere move toward one another and collide. |
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| continental vs. continental |
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| this is when huge slivers of rock,many kilometers wide thrust on top of one another, forming a towering mountain range.thus forming the himalayas |
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| when continental and ocean collide and the dense, leading edge of the oceanic plate actually pulls the rest of the plate into the flowing athenosphere and a subduction zone is born. |
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| when the oceanic crust is pulled under the continental crust, making a subduction zone. |
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| is where two plates slide past one another |
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| process in which the ocean floor is extended when two plates move apart.This causes earth quakes |
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| is where two plates intersect |
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| when subducting oceanic plates sinks deeper than 100 kilometers, huge temperature and pressure increases make the plates sweat. the uncomftorable conditions force minerals in the subducting plate release trapped water and other gases. the gases sweat works up ward , causing a chain of chemical reactions that melt the mantle above the subducting plate. this hot, freshly melted liquid rock or magma makes it's way toward the surface. Most of the molten rock cools and solidifies in huge sponge-like magma chambers far below the earths surface,instantly releasing the huge pressure built up in the gas rich chambers below. as a result a volcano is formed. |
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