Oceanic islands are formed through volcanic eruptions, where magma from the Earth's mantle rises to the surface and solidifies.

Barrier islands are formed by the accumulation of sediment, coral, or other organic material on top of an underwater feature, typically parallel to the coastline.

An atoll is a ring-shaped coral reef that encircles a lagoon, typically found in the central or western Pacific Ocean.

Platform reefs are not a major type of coral reef structure. The three main types are fringing reefs, barrier reefs, and atolls.

Coral reefs thrive in warm, tropical waters, with temperatures typically ranging from 23 to 29 degrees Celsius.

While natural disasters can impact coral reefs, they are not considered a major threat compared to human-induced factors like climate change, overfishing, and pollution.

Corals and photosynthetic algae engage in a mutualistic relationship, where the algae provide the corals with nutrients through photosynthesis, while the corals provide the algae with a protected environment.

Mammals are not a major group of organisms found in coral reef ecosystems, although some marine mammals may occasionally visit or inhabit the area.

Accretion is the process by which coral reefs can adapt to rising sea levels by building upwards through the accumulation of coral skeletons and other reef-building materials.

Introducing invasive species is not a major conservation strategy for protecting coral reefs, as it can disrupt the delicate balance of the ecosystem.

Bleaching is the process by which coral reefs lose their vibrant colors and become bleached, typically due to stress factors such as elevated water temperatures or pollution.

Barrier islands are not a major type of island found in the Indian Ocean. The three main types are continental islands, volcanic islands, and atolls.

Recovery is the process by which coral reefs can recover from bleaching events, typically through the regrowth of coral colonies and the reestablishment of symbiotic relationships.

Barrier reefs are not a major type of coral reef found in the Andaman and Nicobar Islands. The three main types are fringing reefs, atolls, and patch reefs.

Resilience is the process by which coral reefs can adapt to changing environmental conditions, such as rising sea levels or temperature changes, through various mechanisms like accretion and recovery.