Reefs also tend to preferentially form in areas where:
Little clastic sediment occurs (such sediment particles smother reef builders).
Nutrient levels are low.
Water is shallow
Reef builders are zoned in a reef according to their form (encrusting forms tend to dominate the reef crest where wave action is strongest, while more delicate branching forms are confined to deeper water zones where water action is more gentle)
A lagoon can develop behind a reef, where it is protected from
An atoll is a special kind of reef that is ring-shaped and has a central lagoon. It is likely that Gilligan’s Island was set in an partially formed atoll.
An atoll is formed first as a reef that fringes a volcanic island.
As the island sinks (after 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.
Gilligan’s Island ?
Bikini atoll (central Pacific) is a famous nuclear testing site
(the US tested atomic bombs here in the 1940s and 1950s)
So it makes sense that the “new swimsuit for the atomic age”
was named…guess what.
…And we end up back at the beach
Enjoy your break !
END OF LECTURE