Subduction is the process in which one tectonic plate moves beneath another plate at a convergent boundary, resulting in the recycling of old crust back into the Earth's mantle.
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A convergent boundary is where two tectonic plates collide or come together. This collision can result in various geological features such as mountains, volcanic activity, and earthquakes.
Oceanic Trench: An oceanic trench is a long, narrow depression on the seafloor that forms above a subduction zone.
Volcanic Arc: A volcanic arc is a chain of volcanoes that forms above a subduction zone, as magma rises from the subducting plate and erupts onto Earth's surface.