The sea Flashcards
1
Q
Fetch
A
Strength of wind & length of sea
2
Q
Swash
A
Frothy water
3
Q
Backwash
A
Water that runs back from the wave
4
Q
Destructive waves
A
- stormy weather
- backwash stronger than Swash
- erosion
5
Q
Constructive waves
A
- calm weather
- Swash stronger than backwash
- deposition
6
Q
Hydraulic action
A
Power of water as it pounds against the coast
7
Q
Compressed air
A
Trapped air in rocks by waves, shatter rock s
8
Q
Abrasion
A
Waves hurl rocks against coast
9
Q
Attrition
A
Rocks rub off one another
10
Q
Cliffs-erosion
A
- A steep slope on the coast
- Destructive waves attack coast & cut into rock eroding a notch.
- Notch becomes deeper, overhang collapses
- Gently sloping rock surface created
- cliffs of moher co. Clare
11
Q
Long shore drift
A
Waves approach shore at angle
12
Q
The beach-Deposition
A
- Swash carries material on shore then deposits it
- Backwash weaker than Swash (only drags some material back to sea)
- Donabate Beach
13
Q
People and the sea
A
FOOD SUPPLY- Fish caught by trawlers TANSPORT- Bulky goods on ship for long distances Ferries cars and truck and people holidays (tourism) RECREATION- Sailing,fishing,sunbathing
14
Q
Coastal protection
A
GROYNES- low wood walls Right angle Reduces long shore drift (traps sand) GABIONS- Wire cages filled with small stones Break power of erosion SEA WALLS- Concrete walls Curved top to deflect waves back to sea
