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A mid-ocean ridge is an underwater mountain system formed by plate tectonics. It consists of various mountains linked in chains, typically having a valley known as a rift running along its spine. This type of oceanic mountain ridge is characteristic of what is known as an ... The crystallized magma forms new crust of basalt ( known as MORB for ...


At this type of boundary magma rises to the surface and new crust is formed? ... What is called when new crust forms where magma rises at mid ocean ridges?


At a ______ plate boundary new crust is created as two or more plates pull away from ... When oceanic plates collide with continental plates a ______ will form .... A series of mountains that are close together and rise 300m (1,000ft) above its ... transfer heat to the surface, where plumes of less dense magma break apart the ...


Oct 31, 2014 ... Magma exists as pockets and plumes beneath the surface of the ... The rock then cools into new crust. ... Magma can also be created when hot, liquid rock intrudes into Earth's cold crust. ... of the mantle, generating magma that rises to the surface . ... Lava cools to form volcanic rock as well as volcanic glass.


Convergent boundaries - two plates collide to form mountains or a ... The Earth is producing "new" crust where two plates are diverging or spreading apart. ... Because the oceanic plate is bent and driven down, a deep trench forms at this collison ... This liquid rock, called magma, rises to the surface because it is less dense ...


plate boundaries new oceanic lithosphere is created in the ... rock rises and partial melting occurs. New crust is created by the magma pushing up from the.


Magma and Plate Tectonics - Magma is fluid molten rock that exists under the Earth's crust. ... material does melt, forming magma that makes its way through the outer crust. ... The activity at the boundary between some of these plates is the primary catalyst for ... As the magma flows out, it cools, hardening to form new crust.


Aug 26, 2015 ... Note that the lines of force intersect the surface of the Earth at various angles that ... If new oceanic crust and lithosphere is continually being created at the oceanic ridges, the ... There are three types of plate boundaries: ... If the spreading rate ( relative velocity) is high, magma must be rising rapidly and the ...


Feb 24, 2012 ... Covers convergent plate boundaries where an oceanic plate meets a ... New feature! ... The Juan de Fuca Plate is being created at a spreading center, the Juan de ... When two plates converge, what happens depends on the types of ... if magma is too viscous to rise through the crust to erupt at the surface?


The theory of plate tectonics explains most of the features of Earth's surface. .... the other two types. At divergent plate boundaries, new oceanic crust is formed. ... Hotspot volcanoes form as plumes of hot magma rise from deep in the mantle.