How do atolls form?

Answer:

an_atoll_is_formed_first_as_a_reef_that_fringes_a_volcanic_island.">an atoll is formed first as a reef that fringes a volcanic island.

As_the_island_sinks(after_the_volcanic_activity_has_ceased_and_the_crust_has_cooled,_becoming_denser),_the_reef_continues_to_build_upward,_eventually_ending_up_as_a_ring-shaped_structure">As the island sinks(after the volcanic activity has ceased and the crust has cooled, becoming denser), the reef continues to build upward, eventually ending up as a ring-shaped structure

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