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Q: Atolls are _______.
  • A. It is composed of two chains of mountains separated by a large depression
  • B. Gently sloping areas of the ocean basins
  • C. It is a flat topped seamount
  • D. Low islands found in the tropical oceans consisting of coral reefs
Correct Answer: Option D - Atolls are annular mid-ocean reefs. It surrounds a body of water called a lagoon. They are found mostly in oceanic mid-plate settings, where they rest on the peaks of submarine volcanic edifices. Most of the world’s atolls are in the Pacific Ocean and the Indian Ocean. Reef-building corals will thrive only in warm tropical and subtropical waters of oceans and seas, and therefore atolls are found only in the tropics and subtropics. Hence “Low islands found in the tropical oceans consisting of coral reefs” is the correct answer.
D. Atolls are annular mid-ocean reefs. It surrounds a body of water called a lagoon. They are found mostly in oceanic mid-plate settings, where they rest on the peaks of submarine volcanic edifices. Most of the world’s atolls are in the Pacific Ocean and the Indian Ocean. Reef-building corals will thrive only in warm tropical and subtropical waters of oceans and seas, and therefore atolls are found only in the tropics and subtropics. Hence “Low islands found in the tropical oceans consisting of coral reefs” is the correct answer.

Explanations:

Atolls are annular mid-ocean reefs. It surrounds a body of water called a lagoon. They are found mostly in oceanic mid-plate settings, where they rest on the peaks of submarine volcanic edifices. Most of the world’s atolls are in the Pacific Ocean and the Indian Ocean. Reef-building corals will thrive only in warm tropical and subtropical waters of oceans and seas, and therefore atolls are found only in the tropics and subtropics. Hence “Low islands found in the tropical oceans consisting of coral reefs” is the correct answer.