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Show Tides in Inland Seas There are tides in both the Mediterranean Mediter-ranean sea and the Gulf of Mexico. In the Mediterranean they are so slight as to be almost imperceptible ; In the Oulf of Mexico they run from two and a half to f'liir feet. A delta is an alluvial al-luvial plain funned by a deposit of sand and mud carried down a river. As the stream enters quieter waters the deposit fills to the bottom and Increases In-creases in urea and height until It reaches the surface and is raised by floods and tiiles nhove the high-water mark. The delta of tiie Ganges ami the Brahmaputra has an area of '().(XXi square miles and that of the Nile Is 2H0 miies wide and 100 miles long. The Mis.-issipT.I delta, which encroaches at a rale of 'jr.O feet a yen r, has an area of 12."hi square miles. Great delta?-lire delta?-lire nre.v found In compara t i e'y tide less seas, bc-anse the de:,isits wouh not oilier'Ae have a cli.iiee of accu inulat!ng |