Marine geology
7 questions tagged Marine geology — spanning every one of the seven Ws.
When did the Great Barrier Reef begin forming?
The modern Great Barrier Reef began forming about 20,000 years ago, after the last Ice Age ended and sea levels rose. Much of the reef sits on much older foundations, but the present barrier reef is geologically young.
How do coral reefs turn into limestone rock?
Tiny coral polyps build skeletons of calcium carbonate, and over time those skeletons accumulate into reef limestone. If the reef is buried and lithified, it can become solid rock.
When was the first theory of coral reef formation proposed?
Charles Darwin proposed a major theory of coral reef formation in 1842.
Which is the largest coral reef system on Earth?
The Great Barrier Reef is the largest coral reef system on Earth. It stretches for about 2,300 kilometers off the coast of Queensland, Australia.
How do coral reefs depend on the geology of shallow seas?
Reefs grow best in warm, clear, shallow water where sunlight reaches coral algae, usually on stable sea floors.
When was the first white smoker hydrothermal vent discovered?
White smoker vents were identified in the late 1970s, soon after the first hydrothermal vents were found. They were recognized by their lighter, mineral-rich plumes.
How do coral reefs relate to changes in sea level?
Reefs grow upward as corals build calcium carbonate skeletons in shallow, sunlit water. If sea level changes too fast or water conditions worsen, reef growth can slow or stop.