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What is the Strandline?

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The strandline is the area at the top of a beach where debris is deposited on the ebb of the tide. Anything washing onto the shore, whether natural or manmade may be cast up by the waves and left there. On tidal beaches the strandline moves back and forth with the twice-monthly cycle of spring and neap tides. The debris is chiefly composed of stranded seaweed, but can also include litter, either from ships at sea, or sources ashore. The beach at the strandline may consist of rocks, sand, gravel, shingle, pebbles or cobblestones or a mixture of these materials. It may be sandy, muddy, stony and again, often a mix of these.

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