Which plate boundary is characterized by deep-focus earthquakes and explosive, silica-rich stratovolcanoes?

💡 Explanation:

Convergent subduction zones (e.g., oceanic-continental or oceanic-oceanic) are characterized by the subducting slab plunging deep into the mantle, causing deep-focus earthquakes. The presence of water from the subducting plate lowers the melting point of the mantle wedge, producing silica-rich (intermediate/felsic) magma. This viscous magma leads to explosive eruptions and the formation of stratovolcanoes. Divergent and transform boundaries only exhibit shallow-focus earthquakes and generally effusive volcanism (at divergent zones).