Beaches consist of the unconsolidated sediment that lies at the junction between water (oceans, lakes and rivers) and land; they are usually composed of sand, mud or pebbles. Sand beaches are sought after for recreation.
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The sand found on a specific beach is created by its surroundings. It's unique to that beach—like a fingerprint. Most beaches get their sand from rocks on land. Over time, rain, ice, wind, heat, cold, and even plants and animals break rock into smaller pieces.
The word 'beach' comes from Old English 'bæce' (stream). In the period of King Henry VIII the round worn-out pebbles on the British seashore were called beaches.
Along the way, sand is washed ashore, temporarily resting on beaches, until it is re-suspended in the ocean by wave action or wind. The one-way journey down the coast ends when sand is blown inland forming sand dunes, or more commonly, when it flows into a submarine canyon.
What's the situation in the UK? Removing any natural material - including sand and pebbles - from public beaches in the UK is illegal under the Coastal Protection Act 1949. It up to local councils to enforce the law, and offenders can be fined up to £1,000.
Much of the Uk sand comes from rocks most of which are brown or greyish and we have one of the highest tidal movements in the world plus strong winds as mentioned will churn up the sand, Coral seas tend to be clearer because the sand is made of coral and heavier.
Fair-weather wind and wave activity will eventually carry the eroded sand back to the beach. Beach recovery takes months or years, though, because the lower energy waves don't carry as much sediment.
A sea stack is defined as a steep rock formation that's detached from the mainland by the ocean. For this list, I considered big rocks of all kinds that are relatively close to shore.