Ch20_Outline - Chapter 20 Shorelines The shoreline A...

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1 Chapter 20 Shorelines The shoreline: A dynamic interface The shoreline is a dynamic interface (common boundary) between air, land, and the ocean The shoreline is constantly being modified by waves Today the coastal zone is experiencing intense human activity The coastal zone Clarification of terms used to describe the land-sea boundary Shoreline is the line that marks the contact between land and sea The shore is the area that extends between the lowest tide level and the highest elevation on land that is affected by storms
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2 The coastal zone Clarification of terms used to describe the land-sea boundary The coast extends inland from the shore as far as ocean-related features are found Coastline marks the coast’s seaward edge The coastal zone Shore is divided into the Foreshore – area exposed at low tide Backshore – landward of the high-tide shoreline The nearshore zone lies between the low tide shoreline and the point where waves break at low tide Seaward of the nearshore is the offshore zone The coastal zone Beach – an accumulation of sediment found along the landward margin of the ocean or a lake The relatively flat platform composed of sand and marked by a change in slope at the seaward edge is a berm Beach face is the wet sloping surface that extends from the berm to the shoreline
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