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Oceans 11 Ocean Floor Model Vocabulary Name: Alex Pardy Term Description Abyssal Hill A small elevated landform, found only in deep seas, at the edges of Abyssal Plains Abyssal Plains A fairly flat area of the ocean floor, Atoll An Atoll is a ring shaped coral reef, or a chain of coral islands, that enclose or nearly enclose lagoons A bay is a place where land curves inward Bay Continental Shelf Continental Slope Area of seabed around a large landmass where the sea is shallow compared to the open ocean It is the slope between the outer edge of the continental shelf, and the deep ocean floor. Contour Line Is the line on a map, that joins points of equal height above or below sea level Guyot It is a seamount with a flat top. Examples/Pictures Island A piece of land that is surrounded by water Island Arc A curved chain of volcanic islands that are located at a tectonic plate margin A subsea chasm extending along the crest of a mid-ocean ridge, locus of the magma upwellings that accompany seafloor spreading. A submarine mountain Rift Valley Seamount Subduction Zone Submarine Canyon This is a convergent plate boundary where one plate is subducted beneath another, normally because it’s denser A narrow, steep-sided valley cut into a continental slope Trench A Large, large, Narrow, ditch that is formed under the water by the movement of divergent plates. Mid-Ocean Ridges This is an active submarine ridge system that is situated in the middle of an ocean basin, and it marks the site of the upwelling of magma that is associated with seafloor spreading.