Why is the coastline of Augustine Island irregular

1.   ?    Because its been eroded
2.   ?    Through collapse of the volcano during eruptions
3.   ?    Because of earthquakes in the area
4.   ?    Because of the pyroclastic flows

When did Mount Augustine start to erupt

1.   ?    1812
2.   ?    1912
3.   ?    1821
4.   ?    1921

What are the main dangers that Augustine poses

1. Earthquakes
2. Pyroclastic flows
3. Tsunamis
4. Ash falls