A circular or elliptical projection from the seafloor, more than 1 kilometer in height, with a relatively steep slope of 20-25 degrees.

A circular or elliptical projection from the seafloor, more than 1 kilometer in height, with a relatively steep slope of 20-25 degrees.

• A. Guyot
• B. Island Arc
• C. Shelf Break
• D. Seamount

Answer: (D)

A seamount is an underwater volcano that rises from the seafloor but does not reach the surface. Its outline on a map is typically circular or elliptical, and if it stands more than a kilometer above the surrounding seabed with relatively steep slopes around 20–25 degrees, that fits the classic appearance of a seamount. The other features mentioned—a flat-topped shape from wave erosion (a guyot), an above‑water volcanic island chain formed at a subduction zone (an island arc), or a boundary at the edge of the continental shelf (shelf break)—do not describe this structure. So the description points to a seamount.

A seamount is an underwater volcano that rises from the seafloor but does not reach the surface. Its outline on a map is typically circular or elliptical, and if it stands more than a kilometer above the surrounding seabed with relatively steep slopes around 20–25 degrees, that fits the classic appearance of a seamount. The other features mentioned—a flat-topped shape from wave erosion (a guyot), an above‑water volcanic island chain formed at a subduction zone (an island arc), or a boundary at the edge of the continental shelf (shelf break)—do not describe this structure. So the description points to a seamount.