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en.wikipedia.org/wiki/Mid-ocean_ridge

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 ...

www.answers.com/Q/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 up and cools down and creates new crust and the old crust moves away and ...

oceanexplorer.noaa.gov/facts/plate-boundaries.html

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 ...

oceanexplorer.noaa.gov/facts/tectonic-features.html

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 ...

www.nationalgeographic.org/encyclopedia/magma

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.

volcano.oregonstate.edu/how-earths-plates-move-lesson-3

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 ...

www.livescience.com/31377-ocean-crust-formation.html

Apr 26, 2012 ... New ocean crust that forms at mid-ocean ridges on the seafloor may form more ... Mid-ocean ridges are the boundaries between tectonic plates and are the ... magmas that form new crust at fast-spreading ridges rise up from the depths, ... Another possibility is that magma intrudes into already formed rock ...

www.iris.edu/hq/files/programs/education_and_outreach/aotm/11/2a.PlateBoundaries_Background.pdf

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.

www.learner.org/interactives/dynamicearth/slip2.html

The events that occur at these boundaries are linked to the types of plates ... As the oceanic crust sinks, a deep oceanic trench, or valley, is formed at the edge of ... The magma formed at a subduction zone rises up toward the earth's surface ...

science.howstuffworks.com/nature/natural-disasters/volcano1.htm

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.