A long, narrow, characteristically very deep and asymmetrical depression of the sea floor, with relatively steep sides.


Related Terms

ASYMMETRICAL

Not symmetrical

CONSTANT DEVIATION

Deviation which is the same on any heading, as that which may result from certain arrangements of asymmetrical horizontal soft iron

FRACTURE ZONE

1. An extensive linear zone of irregular topography of the sea floor characterized by steepsided or asymmetrical ridges, troughs, or escarpments. 2. An ice area which has a great number of fractures.

BAND-PASSSYSTEM

Aloudspeaker system, often used for subwoofers, in which the speaker is mounted inside an enclosure on a shelf that divides the enclosure into two parts, and one or both parts are coupled to the outside by a vent; the frequency response of the system is that of a fourth-order band-pass filter (one vent) or an asymmetrical sixth-order band-pass filter (two vents).

PLATE GIRDER

A riveted or welded steel girder having a deep vertical web plate with a pair of angles along each edge to act as compression and tension flanges.

METAL-SLITTING SAW

A milling cutter similar to a circular saw blade but sometimes with side teeth as well as teeth around the circumference; used for deep slotting and sinking in cuts.

INSULATION SAMPLER

A device for collecting deep water which prevents any significant conduction of heat from the water sample so that it maintains its original temperature as high-range ohmmeter having a hand-driven direct-current generator as its voltage source.

HIGH-HELIX DRILL

A two-flute twist drill with a helix angle of 3540 ; used for drilling deep holes in metals, such as aluminum, copper, hard brass, and soft steel. Also known as fastspiral drill.

GROUND SWELL

A long, deep swell or undulation of the ocean often caused by a long-continued gale and sometimes a seismic disturbance and felt even at a remote distance. In shallow water the swell rises to a prominent height.

PLAIN

On the sea floor, a flat, gently sloping or nearly level region. Sometimes called ABYSSAL PLAIN in very deep water.

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