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A mid-ocean ridge is an underwater mountain range created at a divergent boundary between two oceanic plates. As the plates move apart, magma from the mantle exits and creates mountains as it cools and hardens.

Image Citation:
Ocean floor fissure. Photography. Britannica ImageQuest, Encyclopædia Britannica, 25 May 2016.
quest.eb.com/search/132_1241774/1/132_1241774/cite. Accessed 29 Oct 2017.

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A volcano is an area in Earth's crust where magma the seeps out.  When the magma reaches the crust it is called lava. Lava creates new crust as it cools and hardens.

Image Citation:
West Mata underwater volcano. Photograph. Britannica ImageQuest, Encyclopædia Britannica, 25 May 2016.
quest.eb.com/search/132_1351510/1/132_1351510/cite. Accessed 29 Oct 2017.

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A Divergent boundary is an area where two of Earth's crustal plates are moving apart or away from one another.

Image Citation:
Illustration of tectonic plates moving apart . Photograph. Britannica ImageQuest, Encyclopædia Britannica, 25 May 2016.
quest.eb.com/search/118_816649/1/118_816649/cite. Accessed 29 Oct 2017.

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A rift valley is a long depression with steep, cliff-like walls that is formed when two continental plates move apart at a divergent boundary.

Image Citation:
Great Rift Valley, Africa. Photography. Britannica ImageQuest, Encyclopædia Britannica, 25 May 2016.
quest.eb.com/search/139_1928372/1/139_1928372/cite. Accessed 29 Oct 2017.