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A submerged mountain range formed by plate tectonics, where new oceanic crust is created through volcanic activity.

A deep, narrow depression in the ocean floor formed by subduction of one tectonic plate beneath another.

A flat, very deep ocean floor, usually found at depths between 3,000 and 6,000 meters, formed by the accumulation of sediment.

A submerged mountain, often volcanic, rising from the ocean floor that does not reach the surface.

A ring-shaped coral reef, island, or series of islets. It encircles a lagoon either partially or completely and is often formed from a submerged volcano.

The extended perimeter of each continent, which is submerged under shallow seas and gulf waters. It marks the area of the seabed around a large landmass where the sea is relatively shallow.

A fissure in the planet's surface that releases geothermally heated water, typically found near volcanically active places, areas where tectonic plates are moving apart, ocean basins, and hotspots.

A flat-topped, submerged extinct volcano, usually found in the deep ocean. It is shaped by erosional processes.

Underwater ecosystems characterized by reef-building corals. Formed by the accumulation of coral skeletons and are found in tropical oceans near the surface where sunlight can reach the symbiotic algae living within the coral tissues.