Which of these statements correctly explains the difference between an atoll and a lagoon?
a. an atoll is a steep mountain with a peaked top, and a lagoon is a mountain with a flat top.
b. an atoll is a coral island formed on top of a volcano, and a lagoon is the water enclosed within it.
c. a lagoon is a coral island formed on top of a volcano rim, and an atoll is the water enclosed within the lagoon.
d. a lagoon is the shallowest part of the ocean, while an atoll is in the deepest part.

The correct answer is B. An atoll is a coral island formed on top of a volcano, and a lagoon is the water enclosed within it.

Explanation

An atoll is the result of geological processes in which a volcanic island is submerged in the sea forming a lagoon with an exit to the sea in its crater, also this is characterized by the formation of corals around it. On the other hand, a lagoon is a container of freshwater that is usually found in continental areas or in atoll. So, the correct answer is B. An atoll is a coral island formed on top of a volcano, and a lagoon is the water enclosed within it.

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