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Boundaries Review. By: Allison LaBuda. What is a convergent boundary?. When two or more tectonic plates or fragments of the lithosphere more toward each other and collide. Continental vs. Continental.
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Boundaries Review By: Allison LaBuda
When two or more tectonic plates or fragments of the lithosphere more toward each other and collide.
Where two continental plates collide the plates either buckle and compress or (in some cases) one plate delves called subduction, under the other.
continental crustal material is transferred to oceanic crust by sedimentation. New material can be added to the continents by the partial melting of oceanic crust at subduction zones, causing the lighter material to rise as magma, forming volcanoes. Also, material can be accreted "horizontally" when volcanic island arcs, seamounts or similar structures collide with the side of the continent as a result of plate tectonic movements.
When two plates with oceanic crust converge, they typically create an island arc as one plate is subducted below the other. The arc is formed from volcanoes which erupt through the overriding plate as the descending plate melts below it. The arc shape occurs because of the spherical surface of the earth
A linear feature that exists between two tectonic plates that are moving away from each other.
occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge. Seafloor spreading helps explain continental drift in the theory of plate tectonics.
faults neither create nor destroy lithosphere, is a type of fault whose relative motion is predominantly horizontal in either sinistral or dextral direction. Furthermore, transform faults end abruptly and are connected on both ends to other faults, ridges, or subduction zones.
The sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away
a chain of volcanoes parallel to a mountain belt positioned in an arc shape.Caused by a Convergent Boundary Example: The Ryukyu Islands arc
The zone of volcanic activity surrounding the Pacific Ocean.
An opening in the earth's crust through which molten lava, ash, and gases are ejected.Caused by Convergent BoundaryExample: Krakatoa Volcano
A large natural elevation of the earth's surface rising abruptly from the surrounding level.Caused by a Convergent BoundaryExample: Andes Mountain Range