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CONVERGENT MARGINS: (1) Typically, Oceanic Crust (A), will be subducted back into the Mantle (B). (2) Downgoing Crust and nearby Mantle are partially melted to (3) produce Magma (C) which rises producing a Volcanic Arc (D). (4) The boundary between the slab and the upper plate is a thrust fault (F). Earthquakes are common, deep, and strong here. (5) Sediment on the slab (E) (6) is scraped off and tectonically kneaded into an Accretionary Wedge at the Trench (F). (7) Sediment from the arc is trapped in the fore-arc basin (H) (8) and the back-arc basin. The Aleutian and Philippine islands are Volcanic Arcs.