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	Eng ID	Term	Definition
	4701	shading	Gradations of light, colour, or thickness of lines; or indications of shadows. Shading of lines is sometimes used on CHARTS to produce the e... more Gradations of light, colour, or thickness of lines; or indications of shadows. Shading of lines is sometimes used on CHARTS to produce the effect of HEIGHT or DEPTH. See also HILL SHADING.
	4702	shadow pin	A small rod or pin used to cast a shadow on an instrument, such as a MAGNETIC COMPASS or SUN COMPASS, to determine the direction of the lum... more A small rod or pin used to cast a shadow on an instrument, such as a MAGNETIC COMPASS or SUN COMPASS, to determine the direction of the luminary; a GNOMON.
	4703	shadow zone	A region into which very little sound energy penetrates.
	4704	shallow	(adj.). Having little DEPTH.
	4705	shallow	(n.). An area composed of unconsolidated material where the DEPTH of water is relatively slight. It may be a hazard to SURFACE NAVIGATION.
	4706	shallows	An indefinite term applied to expanses of SHOAL or SHALLOW WATER.
	4707	shallow water	Commonly, water of such a DEPTH that SURFACE WAVES are noticeably affected by bottom topography. It is customary to consider water of DEPTH... more Commonly, water of such a DEPTH that SURFACE WAVES are noticeably affected by bottom topography. It is customary to consider water of DEPTHS less than half the surface WAVE LENGTH as shallow water.
	4708	shallow water constituent	A short-period harmonic term introduced into the formula of ASTRONOMICAL TIDE constituents to take account of the change in the form of a T... more A short-period harmonic term introduced into the formula of ASTRONOMICAL TIDE constituents to take account of the change in the form of a TIDE WAVE resulting from SHALLOW WATER conditions. Shallow water constituents include OVERTIDES and COMPOUND TIDES. See HARMONIC CONSTITUENT.
	4709	shallow water corrections	Quantities to be applied to a TIDE PREDICTION to correct for the QUARTER DIURNAL TIDES.
	4710	shallow water tide(s)	See TIDE.
	4711	shallow water wave	See WAVE: TRANSITIONAL WATER.
	4712	shear strength	The internal resistance of a body to shear stress.
	4713	shelf	Geologically an area adjacent to a continent or around an island and extending from the low-water line to the depth at which there is usuall... more Geologically an area adjacent to a continent or around an island and extending from the low-water line to the depth at which there is usually a marked increase of slope towards greater depth. See also CONTINENTAL SHELF.
	4714	shelf break	See SHELF EDGE.
	4715	shelf edge (or shelf break)	The line along which there is a marked increase of SLOPE at the seaward margin of a CONTINENTAL (or ISLAND) SHELF.
	4716	shell	The hard outside covering of an animal. Part of the ocean bed is composed of numerous shells of marine animals.
	4717	shelving	A gently sloping area.
	4718	shimmer	Apparent fluttering of objects at the EARTH's surface, when they are viewed in an almost horizontal direction above strongly heated surfaces... more Apparent fluttering of objects at the EARTH's surface, when they are viewed in an almost horizontal direction above strongly heated surfaces.
	4719	shingle	Rounded, often flat waterworn rock fragments larger than approximately 16 millimetres.
	4720	ship of opportunity	An expression designating ships of commercial lines employed in gathering oceanographic DATA.
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