Términos

High, narrow, tower-like formations of rock or coral, located beneath the surface of the ocean.

Flat, gently sloping regions located beneath the surface of the ocean.

Flat or gently sloping underwater surfaces, extending seaward from shorelines.

Gentle slopes located on the sea floor, which connect areas of varying elevations. [For PH - no add'l warrant for "undersea ramps" though some warrant for "submarine ramps."]

Series of associated undersea ridges or seamounts.

Small canyons, located on the sea floor.

Long narrow elevations with steep sides, located on the sea floor.

Broad elevations on the sea floor that gently rise.

Low parts of the sea floor that resemble a saddle, located on undersea ridges or between contiguous seamounts.

Lines along which there are marked increases of slope, at the outer margins of continental shelves or island shelves.

Areas of broad elevation that rise gently, and generally smoothly, from the sea floor.

Valleys on shelves on the sea floor; generally the shoreward extensions of canyons.

Zones adjacent to continents (or around islands) that extend from low water lines to a depth at which there are marked increases of slopes towards oceanic depths.

Areas or mounds of unconsolidated material undersea.

Low parts of an underwater gap that are separated by basins; includes similar features at the mouthes of fjords.

Slopes that run seaward from the shelfs edge to the beginning of continental rises, or to points where the slopes are reduced.

Subordinate elevations, ridges, or rises on the sea floor that project outward from larger features.

Flat horizontal or gently inclined surfaces on the sea floor, often long and narrow, and which are bounded by steeper ascending and descending slopes.

Tongue-like extensions of a flat sea floor into adjacent, higher features.

Deep, narrow, asymmetrical depressions on the sea floor, with somewhat steep sides.