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See also:BAR (0. Fr. See also:barre, See also:Late See also:Lat. See also:barra, origin unknown) , in See also:physical See also:geography, a See also:ridge of See also:sand or silt See also:crossing an See also:estuary under See also:water or raised by See also:wave See also:action above See also:sea-level, forming an impedimentto See also:navigation . When a See also:river enters a tidal sea its See also:rate of flow is checked and the material it carries in suspension is deposited in a shifting See also:bar crossing the channel from See also:bank to bank . Where the channel is only partly closed, a See also:spur of this See also:character is called a " See also:spit." A bar may be produced by tidal action oily in an estuary or narrow gulf (as at See also:Port See also:Adelaide) where the tides sweep the loose sand backwards and forwards, depositing it where the See also:motion of the water is checked . Nahant See also:Bay, See also:Mass., is bordered by the ridge of See also:Lynn See also:Beach, which separates it from Lynn Harbor, and ties Nahant to the mainland by a bar formed in this way . |
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