Geologic features that might form at the surface of Plate A include:
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Volcanoes: When an oceanic plate collides with a continental plate, the oceanic plate is forced beneath the continental plate in a process called subduction. This can cause magma to rise to the surface and form volcanoes.
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Trenches: Deep ocean trenches can form where tectonic plates are being subducted.
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Island arcs: Volcanic deposits can pile up until they break through the surface of the ocean and form an island arc.
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Submarine mountain ranges: When two plates are moving away from each other, magma rises from deep within the Earth and erupts to form new crust on the lithosphere. This can result in the formation of submarine mountain ranges.
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Fault lines: Fault lines can form at plate boundaries where two plates are moving past each other.
Overall, the geologic features that form at the surface of Plate A are largely determined by the type of plate boundary present and the direction of plate movement.
