Geologically, What Is the Best Way to Explain the Thousands

Multiple Choice

Geologically, what is the best way to explain the thousands of feet of coral limestone beneath most atolls?

A) An eroded volcanic seamount rose thousands of feet after the limestone formed.
B) The eroded volcano slowly sank as sea level remained steady or rose gradually.
C) The volcano never reached the surface, allowing a very thick cap of coral limestones to accumulate.
D) Sea level has fallen thousands of feet since the reef began to grow.