Key (also cay) 



Low insular bank of sand, coral, etc. 



Lagoon 



Shallow body of water, usually connected to sea. 



Levee 



Usually manm.ade dike or embankment to protect land from inundation. 



Life ay ale (life stage) 



The various phases or chances through which an individual passes in 

 its development from the fertilized egg to the mature organism. 



Lightering buoy 



Point buoy; tie up for a small craft; see buoys and floats. 



Littoral 



Of or pertaining to a shore. 



Littoral drift 



Sedimentary material in littoral zone under influence of waves and cur- 

 rents. 



Littoral transport 



Movement of littoral drift by waves and currents; includes movement par- 

 allel to and perpendicular to shore. 



Marina 



Small harbor or boat basin providing dockage, supplies, and services for 

 small pleasure craft, see harbor. 



Marine way (also marine railway , launohway) 



Railway extending into water used to launch or to pull vessels from 

 water; see vamp. 



Mean high water 



Average height of high waters over a 19-yr period (MHW). 



Mean low water 



Average height of low waters over a 19-yr period (MHW). 



Mean sea level 



Averaoe height of surface of sea for all staces of tide over 19-yr period 

 (MSL). 



Mean tide level 



Plane midway between mean high water and mean low water (also half-tide 

 level ). 



Migration 



Mass movement of animals to and from feeding, reproduction, or nesting 

 areas. 



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