Plains<span> occur as lowlands along the bottoms of </span>valleys<span> or on the doorsteps of mountains, as coastal </span>plains<span>, and as plateaus or uplands. In a </span>valley<span>, a </span>plain<span> is enclosed on two sides but in other cases a </span>plain<span> may be delineated by a complete or partial ring of hills, by mountains or cliffs.</span>
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A spit is a type beach erosion called Longshore drift, a bar is formed by deposition of material by streams or currents
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Definition of mayor-council. : of, relating to, or constituting a method of municipal government in which policy-making and administrative powers are vested in a usually elective mayor and council — compare council-manager plan, strong mayor, weak mayor.