Which risk increases near a volcano with a silica-rich lava dome growing within its caldera?

💡 Explanation

Pyroclastic flow risk increases because a silica-rich lava dome's blocky material destabilizes, leading to dome collapse events and creating pyroclastic flows; therefore, A is correct, rather than other options like lahars which require water interaction.

• Which mechanism MOST directly causes meandering stream formation on a gently sloping floodplain?
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• Which process generates a tarn when glacial ice melts within a cirque basin?
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