Secondary impacts
Social - People are killed, fires can start due to the lava, mudflows can cause further damage and deaths.
Environmental- Ecosystems can be destroyed due to flow of volcanic material, acid rain can cause acidification of aqautic ecosystems, enhanced greenhouse effects due to the release of gas.
Economic- Eruptions can destroy businesses, ash clouds prevent aircraft flying, damage to buildings can be exspensive to repair, eruptions can attract tourists boosting the economy.
Political- Damage to agricultural land can cause food shortages leading to conflict and political unrest, slows development due to countries having to repair rather than build schools and hospitals etc,.
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