A(n)________ is a low lying, coral reef island perched above a sunken, truncated volcano.

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An atoll is a type of coral reef island that is formed as a ring-shaped or horseshoe-shaped coral reef encircling a lagoon, and often perched above a sunken, truncated volcano. Atolls are typically low-lying and found in tropical waters. Guyots are submerged, flat-topped seamounts, while seamounts are underwater mountains that rise at least 1,000 meters above the seafloor. A re-entry cone is a term used in aerospace engineering and refers to a type of spacecraft heat shield.

A(n)________ Is a Low Lying, Coral Reef Island Perched Above