Question

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

Explanation:

Composite volcanoes (also known as stratovolcanoes) are formed from alternating layers of lava flows and pyroclastic material. In subduction zones, the subducting plate melts, and the magma has a higher silica content, leading to more explosive eruptions which are characteristic of composite volcanoes. Cinder cones are also common in such settings. They form from volcanic ash, cinders, and small rocks ejected from a single vent during moderately explosive eruptions. Shield volcanoes (associated with non - explosive, fluid lava flows) and fissure eruptions (associated with rift zones) are more common in other tectonic settings like mid - ocean ridges or hotspots. Rift and non - explosive eruption are not types of volcanoes.

Answer:

composite and cinder