COASTS: Coastal Processes Flashcards Preview

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Flashcards in COASTS: Coastal Processes Deck (46)
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1

What are the processes of erosion?

  1. Abrasion (corrasion)
  2. Hydraulic action
  3. Cavitation
  4. Wave quarrying
  5. Solution (corrosion)
  6. Attrition

2

Abrasion (corrasion)

Rock and sediment transported by the waves smash against he rocks and cliffs, breaking bits off and smoothing the surfaces.

3

Hydraulic action 

Air in cracks in cliffs is compressed when waves crash in.

Pressure exerted by the compressed air breaks off rock pieces.

4

Cavitation

As waves recede, the compressed air expands violently, again exerting pressure on the rock and causing pieces to break off.

5

Wave quarrying 

The energy of a wave as it breaks against a cliff is enough to detach rock.

6

Solution (corrosion)

Soluble rocks get gradually dissolved by the seawater.

7

Attrition

Rock and sediment in the water smash against each other and breaks into smaller pieces.

8

Rock and sediment transported by the waves smash against he rocks and cliffs, breaking bits off and smoothing the surfaces.

Abrasion (corrasion)

9

Air in cracks in cliffs is compressed when waves crash in.

Pressure exerted by the compressed air breaks off rock pieces.

Hydraulic action 

10

As waves recede, the compressed air expands violently, again exerting pressure on the rock and causing pieces to break off.

Cavitation

11

The energy of a wave as it breaks against a cliff is enough to detach rock.

Wave quarrying 

12

Soluble rocks get gradually dissolved by the seawater.

Solution (corrosion)

13

Rock and sediment in the water smash against each other and breaks into smaller pieces.

Attrition

14

What are the processes of transportation?

  1. Solution
  2. Saltation
  3. Suspension
  4. Traction

15

Solution

Substances dissolve and are carried along in the water. 

Eg. limestone dissolved in acidic water.

16

Saltation

The force of the water causes larger particles to bounce along the sea bed.

17

Suspension

Very fine material is whipped by turbulence and carried in the water. 

Most common transportation in coastal systems.

18

Traction

Large particles are pushed along the sea bed by the force of water. 

19

Substances dissolve and are carried along in the water. 

Eg. limestone dissolved in acidic water.

Solution

20

The force of the water causes larger particles to bounce along the sea bed.

Saltation

21

Very fine material is whipped by turbulence and carried in the water. 

Most common transportation in coastal systems.

Suspension

22

Large particles are pushed along the sea bed by the force of water. 

Traction

23

Marine deposition

Sediment carred by seawater is deposited.

24

Aeolion depostion

Sediment carried by the wind is deposited.

25

Give two reasons why wind or water might slow down:

  1. Friction increases 
  2. Flows becomes turbulent

26

Sub-aerial weathering

The gradual break down or rock by agents such as ice, salt, plants roots and acids. 

27

What are the different types of weathering?

Chemical 

Mechanical 

Biological

28

What are the different types of chemical weathering?

Carbonation

Oxidation

29

What are the different type of mechanical weathering?

Freeze-thaw

Salt crystallisation

Wetting and drying

Exfoliation

30

Biological weathering

Growing plant roots widen cracks.