Question

which two types of volcano are most often formed near offshore trenches in subduction zones?
rift and nonexplosive eruption
composite and shield
shield and fissure
composite and cinder

Explanation:

Subduction zones involve dense oceanic plates sinking into the mantle, generating magma with high silica content that fuels explosive or semi-explosive volcanoes. Composite (stratovolcanoes) form from alternating layers of lava and pyroclastic material, common in subduction zones. Cinder cones are small, steep volcanoes built from pyroclastic fragments, also frequently associated with these tectonic settings. Shield volcanoes form from low-silica, fluid lava (hotspots/mid-ocean ridges), while rift/fissure volcanoes are linked to divergent boundaries, not subduction zones.

Answer:

composite and cinder