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	Eng ID	Term	Definition
	4421	ridge	The linked major mid-oceanic mountain systems of global extent. Also called mid-OCEANIC RIDGE.
	4422	rift	A cleft, fissure or chasm in the EARTH. See MEDIAN VALLEY.
	4423	rift valley	See MEDIAN VALLEY.
	4424	rig	A temporary, mobile structure, either fixed or floating, used in the exploration stages of oil and gas fields.
	4425	right ascension	ANGULAR DISTANCE east of the vernal EQUINOX; the arc of the CELESTIAL EQUATOR, or the angle at the CELESTIAL POLE, between the HOUR CIRCLE o... more ANGULAR DISTANCE east of the vernal EQUINOX; the arc of the CELESTIAL EQUATOR, or the angle at the CELESTIAL POLE, between the HOUR CIRCLE of the vernal EQUINOX and the HOUR CIRCLE of a point on the CELESTIAL SPHERE, measured eastward from the HOUR CIRCLE of the vernal EQUINOX through 24 hours.
	4426	right bank	Of a RIVER, the BANK on the right-hand side as one proceeds downstream.
	4427	right reading image	An IMAGE which may be read or observed normally whether in NEGATIVE or POSITIVE form.
	4428	rill mark	A small groove, furrow or CHANNEL made in MUD or SAND on a BEACH by tiny STREAMS following an outflowing TIDE.
	4429	rip current	See CURRENT.
	4430	ripple	The ruffling of the surface of water, hence a little curling WAVE or UNDULATION. A WAVE controlled to a significant degree by both surface t... more The ruffling of the surface of water, hence a little curling WAVE or UNDULATION. A WAVE controlled to a significant degree by both surface tension and GRAVITY.
	4431	ripple mark	Undulating surface features of various shapes produced in unconsolidated sediments by wave or current action.
	4432	rip-rap	See GROIN.
	4433	rips	A turbulent agitation of water generally caused by the interaction of CURRENTS and WIND; in nearshore regions, rips may also be caused by CU... more A turbulent agitation of water generally caused by the interaction of CURRENTS and WIND; in nearshore regions, rips may also be caused by CURRENTS flowing swiftly over an irregular BOTTOM.
	4434	rise	A broad ELEVATION that rises gently and generally smoothly from the SEAFLOOR.
	4435	rise	A broad ELEVATION that rises gently and generally smoothly from the SEAFLOOR.
	4436	rise of tide	The HEIGHT of HIGH WATER above DATUM. Also called tidal rise.
	4437	rising tide	See TIDE.
	4438	river	A relatively large natural STREAM of water.
	4439	river discharge	The rate of FLOW of water past a point in a STREAM, expressed as volume per unit time (usually cubic feet per second).
	4440	river harbour	A harbour which lies on the banks of a river.
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