Términos

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.

Depressions on the sea floor with characteristically flat bottoms and steep sides; usually more shallow than undersea trenches.

Relatively shallow, wide depressions, usually with continuous gradient, and located on the sea floor.

Trees growing beneath the level of the tallest trees in a forest, therefore being somewhat sheltered from full sunlight.

Sites that are underwater and where archaeological excavations or exploration takes place. Included are shipwrecks, harbor and dock remains, fishing structures, and flooded land sites.

Geomorphic features of the earth's surface that are located underwater, but not undersea. For features under the surface of the ocean, use "undersea features."

Indication in texts, databases, tables, and lists when information for the instance at hand is not determined. For information that is unavailable to the cataloger or other information provider, rather than being in general undetermined, prefer "unavailable."