Where are strata volcanoes commonly found? What type of
plate boundary are they near?

subduction zones

Explanation:

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Stratovolcanoes are also commonly called composite volcanoes. Mt. Fuji in Japan is an example of a stratovolcano. Stratovolcanoes are most found commonly along subduction zones, which are boundaries between two tectonic plates where an oceanic plate is sinking into the mantle beneath another tectonic plate.