Seamount

Science / Geology / Seamount: A mountain on the sea floor that has at least 1000 meters of local relief. Most seamounts are shield volcanoes. (See also Guyot.)

Atoll

Science / Geology / Atoll: A ring-shaped group of coral islands that are surrounded by deep ocean water and that enclose a shallow lagoon. MORE

Guyot

Science / Geology / Guyot: A flat-topped submerged mountain or seamount found in the ocean. MORE

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