Coral islands are made of . A.
the remains of small marine organisms
B.
volcanic magma and ash
C.
worn-down mountains
D.
sand and rock

The correct answer is A. the remains of small marine organisms.

Explanation:

 Coral islands, as their name implies, are made up of coral reefs. It is a less common type of training. Its development occurs when coral reefs settle on submerged rocks.

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