How can coral atoll be attached to ocean floor when cannot live or form reefs in the deep ocean?

Corals cannot live or form reefs in the deep ocean due to the lack of sunlight and the high pressure. However, coral atolls can be attached to the ocean floor in deep water through a process called subsidence. Subsidence occurs when the ocean floor sinks due to the weight of the coral reef, the movement of tectonic plates, or other geological processes. As the reef grows upward, the ocean floor beneath it sinks, allowing the coral to continue growing in shallow water. This process can result in the formation of coral atolls, which are ring-shaped coral reefs that are attached to the ocean floor in deep water.

In addition to subsidence, some coral atolls may also be formed through the process of seamount volcanism. Seamounts are underwater mountains that rise from the ocean floor. If a seamount reaches the surface of the water, it can become a volcanic island. Over time, coral reefs may grow around the volcanic island, forming a coral atoll.