Trivia: Micronesia and Polynesia are dominated by what type of islands?
Tidal
Coral
Artificial
Barrier
The correct answer is Coral
So why is this answer correct? : Also called “low islands,” coral islands barely reach above sea level and are made by coral reefs that build up around volcanic islands. Many form a coral atoll — as the volcanic island erodes, all that’s left is a ring-shaped coral reef with a lagoon at its center. Micronesia and Polynesia, two subregions of Oceania, are full of atolls, which are typically uninhabited.