Which mechanism causes secondary volcanic cones to form on the flanks of stratovolcanoes?

💡 Explanation

When internal pressure builds within a stratovolcano, magma migrates along radial fissures because the edifice's structure creates lines of weakness, leading to localized eruptions and formation of secondary cones. Therefore, magma migration is responsible rather than crustal thinning, pyroclastic flow erosion, or isostatic rebound which require specific conditions.

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