I want to know the answer to the following question:
Why is the top of the seamount formed by marine organisms?
All the background I'm provided with is that "The top of the seamount has gone through periods of complete submergence, during which its limestone cap was formed by marine organisms, and during the Ice Ages the entire caldera was above sea level, forming an island of approximately two hundred square miles.". Is that enough to answer the question?
Answer: yes