_______ is a flat-topped seamount.

Correct option is C

Introduction
A Guyot is a distinctive type of submarine mountain (seamount) that is characterized by a flat top. The flat top suggests that the volcano, which formed the seamount, was once above sea level, where its peak was eroded by wave action. As the oceanic plate moved and cooled, the seamount subsided, carrying the flattened peak below the ocean surface.
Information Booster
· Definition: An underwater mountain (seamount) with a distinctive flat top.
· Formation: Guyots were once volcanic islands above sea level.
· Erosion: The peaks were flattened by wave erosion when they were exposed to the surface.
· Submergence: They subsequently subsided below sea level due to the cooling and sinking of the oceanic crust.
· Alternative Name: They are sometimes referred to as tablemounts.
Additional Points
· Atoll: A ring-shaped coral reef, island, or series of islets surrounding a lagoon, formed on a subsided volcanic island.
· Abyssal Plain: A flat or gently sloping area of the deep ocean floor, usually found at depths between 3,000 and 6,000 metres.
· Mid-Oceanic Ridge: A continuous, underwater mountain range formed by plate tectonics, where new oceanic crust is created.