Natural Disasters questions

1.On December 26, 2004, a pair of closely related natural disasters killed tens of thousands of people.

a. What was the initial cause of the event, not the one that apparently killed most of the people (the general name for the type of disastrous event)?

b. Where (location), specifically, did that initial event happen?

c. What was the specific kind of that initial event (the variety of the general event noted in part “a”) and the exact nature of it?

d. What secondary event (the one that killed most of the people) was caused by the initial event noted above (the general name for that type of event)?