Deposit of pebbles, gravel and sand along coastline
Answers
Beaches
A beach is a landform along the coast of an ocean or sea. It usually consists of loose particles, which are often composed of rock, such as sand, gravel, shingle, pebbles, or cobblestones. The particles comprising a beach are occasionally biological in origin, such as mollusc shells or coralline algae.
Beaches typically occur in areas along the coast where wave or current action deposits and reworks sediments.
Beach may refer to:
- small systems where rock material moves onshore, offshore, or alongshore by the forces of waves and currents; or
- geological units of considerable size.
The former are described in detail below; the larger geological units are discussed elsewhere under bars.
The four sections of most beaches.
1. Swash zone: is alternately covered and exposed by wave run-up.
2. Beach face: sloping section below berm that is exposed to the swash of the waves.
3. Wrack line: the highest reach of the daily tide where organic and inorganic debris is deposited by wave action.
4. Berm: Nearly horizontal portion that stays dry except during extremely high tides and storms. May have sand dunes.
The four sections of most beaches.
There are several conspicuous parts to a beach that relate to the processes that form and shape it.
- Swash zone: is alternately covered and exposed by wave run-up.
- Beach face: sloping section below berm that is exposed to the swash of the waves.
- Wrack line: the highest reach of the daily tide where organic and inorganic debris is deposited by wave action.
- Berm: Nearly horizontal portion that stays dry except during extremely high tides and storms. May have sand dunes.
Answer:
Depositional features are beach, sandbars, spit, lagoon and dunes. Beaches are formed by the deposition of sand, gravel and, pebbles. The narrow, elongated deposits of sand and gravel that built up on the sea floor parallel to the coastline are called sandbars.
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