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Diagram A and B are both examples of ( divergent, convergent ) plate boundaries.
Diagram A is an example of two ( oceanic, contiental ) plates moving apart. Diagram B is an example of two ( continental, oceanic ) plates moving apart.
At the plate boundary on diagram A, land is being ( created, destroyed ) by magma coming up and cooling. The magma comes up to create a long series of volcanoes called a ( ridge, fault, trench ). ( Earthquakes, Volcanoes ), in addition to volcanoes, also occur at this plate boundary.
At the plate boundary on diagram B, the thick continental crust is stretching and a ( rift valley, ridge, fault, volcanic arc ) is being made. Over time, the rift valley will get wider and deeper. ( Earthquakes, Volcanic Arcs ) also occur at this plate boundary.