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The lines represent tectonic plate boundaries. Oceanic crust is the uppermost layer of the oceanic portion of a tectonic plate. The crust ... Layer 3 is formed by slow cooling of magma beneath the surface and consists of coarse ... As plates diverge at these ridges, magma rises into the upper mantle and crust. .... New Scientist.


At this type of boundary magma rises to the surface and new crust is formed? ... new crust forms at divergint bounderies where plates move apart magma oozes ...


Mar 11, 2014 ... The Earth's outer crust (the lithosphere) is composed of a series of tectonic plates . ... If two tectonic plates collide, they form a convergent plate boundary. ... Deep trenches are often formed where tectonic plates are being subducted and ... The new magma (molten rock) rises and may erupt violently to form ...


Beneath the rift, magma—molten rock—rises from the mantle. It oozes up into the gap and hardens into solid rock, forming new crust on the torn edges of the ...


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 Earth. ... How Magma Forms. Earth is ... The rock then cools into new crust. ... seafloor would lower the melting temperature of the mantle, generating magma that rises to the surface. ... Lava cools to form volcanic rock as well as volcanic glass.


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.


Sep 15, 2014 ... Divergent boundaries -- where new crust is generated as the plates ... Illustration of the Main Types of Plate Boundaries [55 k] ... where plates are moving apart and new crust is created by magma ... When the continental crust stretches beyond its limits, tension cracks begin to appear on the Earth's surface.


At a tensional or constructive boundary the plates are moving apart. ... When the magma reaches the surface, it cools and solidifies to form a new crust of ... At a constructive plate margin, new crust is created by magma rising through the gap. < · >.