Explore an overview of subduction zones, including sites of lithospheric scale recycling, critical to understanding the chemical evolution of the Earth's crust and mantle, volcanism, earthquakes, and orogenesis. Includes the thermal and seismic structure of subduction zones, volatile and geochemical cycling, seismicity, mantle wedge dynamics, and volcanism. Geological Sciences 386S and 391 (Topic: Ins & Outs of Subduction Zones) may not both be counted. Three lecture hours per week for one semester.