The exam board requires that you know “A case study of a volcanic eruption: to include its cause, primary and secondary effects and the responses to it.”
This case study covers all of these things for you.
Click on this link for the summary and revision sheet for this cases study. Case_study_handout Notice how much place specific information there is in there. Make sure you know this as well as all the general responses, effects and causes.
This video link shows the effects of the eruption as does this photo too.