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Geography Coastal Zones Flashcards
Fichas del conjunto (20)
- 1How are waves created? (4 points)Wind blows over the surface of the sea. Friction created causes a swell. The energy in the particles rotate and move forward.
- 2Factors affection the size/ energy of a wave.Time: How long the wind has blown.
Strength: Of the wind.
Fetch: How far the waves have travelled. - 3the longer the fetch?The more damage!
- 4Define: SwashThe movement of the waves, entering the coast at an angle.
- 5Define: Backwash.The return of the swash to he sea, goes out perpendicular to the coast.
- 6Destructive waves...♢Created in storms
♢Created over a long time
♢Erodes coast
♢Has a strong backwash
♢Has a short wavelength - 7Constructive waves...♢Created in calm weather
♢Break on the shore
♢Deposit material (beaches)
♢Strong swash
♢Long wavelength
♢Short height - 8What types of waves occur when: The swash is stronger?Constructive waves
- 9What types of waves occur when: The backwash is stronger?Destructive Waves
- 10Destructive waves cause: Hydraulic actionAir trapped in cracks of a cliff are compressed and weakens the cliff.
- 11Destructive waves cause: AbrasionThe Sandpaper Effect. Rocks and sand grind down cliff surfaces.
- 12Destructive waves cause: AttritionRocks bump into each other to become rounder and smoother.
- 13Destructive waves cause: SolutionAcids in the sea water dissolve weal rock such as limestone.
- 14What is Transportation?When the swash and backwash bring in and return material to and from the sea.
- 15What is meant by Longshore Drift (LSD)?The continuous movement of material to and from the sea (transportation).
- 16COASTAL TRANSPORT: SolutionDissolved minerals in the sea.
- 17COASTAL TRANSPORT: SuspensionSmall particles suspended at the surface of the sea
- 18COASTAL TRANSPORT: SaltationLightweight load is bounced along the sea bed.
- 19COASTAL TRANSPORT: TractionLarge load e.g. pebbles, are rolled along the seabed.
- 20Where does deposition occur?♢Sheltered areas
♢Where there is little wind
♢ Where there is a substantial amount of material.
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