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atoll - A continuous or broken circle of coral reef and low coral islands surrounding a central lagoon.
autochthonous - Refers to something formed in its present location. backwash - The return flow of water down a beach after a wave has broken.
bar-finger sand - An elongated lens of sand deposited during the growth of a distributary in a delta.
The bar at the distributary mouth is the growing segment of the bar finger.
archipelago - A group of islands; an expanse of water with scattered islands.
bankfull stage - The height of water in a stream that just corresponds to the level of the surrounding floodplain.
bar - A unit of pressure equal to 10 to the sixth dynes/square centimeter; approximately one atmosphere.
aeolian process - A geological modification, such as sand dunes or erosion, caused by wind activity. algal mat - A layered communal growth of algae observed in fossils and in present day tidal zones associated with carbonate sedimentation.
alkali metal - A strongly basic metal like potassium or sodium.
abyssal plain - The ocean floor offshore from the continental margin, usually very flat with a slight slope.