Geologically, What Is the Best Way to Explain the Thousands

question 69

Multiple Choice

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

• A)Sea level has fallen thousands of metres since the reef began to grow.
• B)An eroded volcanic seamount rose thousands of metres after the limestone formed.
• C)The eroded volcano slowly sank as sea level remained steady or rose gradually.
• D)The volcano never reached the surface, but built a very thick cap of coral limestones from its deep submarine hot springs emissions.

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